In linguistics, homonyms, broadly defined, are words which sound alike or are spelled alike, but have different meanings. A more restrictive definition sees homonyms as words that are simultaneously homographs (words that share the same spelling, regardless of their pronunciation) andhomophones (words that share the same pronunciation, regardless of their spelling) – that is to say they have identical pronunciation and spelling, whilst maintaining different meanings. The relationship between a set of homonyms is called homonymy. Examples of homonyms are the pair stalk (part of a plant) and stalk (follow/harass a person) and the pair left (past tense of leave) and left (opposite of right). A distinction is sometimes made between true homonyms, which are unrelated in origin, such as skate (glide on ice) and skate (the fish), and polysemous homonyms, or polysemes, which have a shared origin, such as mouth (of a river) and mouth (of an animal).
In non-technical contexts, the term "homonym" may be used (somewhat confusingly) to refer to words that are either homographs or homophones. The words row (propel with oars) and row (argument) and row (a linear arrangement of seating) are considered homographs, while the words read (peruse) and reed (waterside plant) would be considered homophones; under this looser definition, both groups of words represent groups of homonyms.
The adjective homonymous can additionally be used wherever two items share the same name, independent of how close they are or aren't related in terms of their meaning or etymology.
The word homonym comes from the Greek ὁμώνυμος (homonymos), meaning "having the same name", which is the conjunction of ὁμός (homos), "common, same,
similar " and ὄνομα (onoma) meaning "name". Thus, it refers to two or more distinct concepts sharing the "same name" or signifier. Note: for the h sound, see rough breathing and smooth breathing.
Euler diagram showing the relationships between homonyms (between blue and green) and related linguistic concepts.
Several similar linguistic concepts are related to homonymy. These include:
Homographs (literally "same writing") are usually defined as words that share the same spelling, regardless of how they are pronounced.[note 1] If they are pronounced the same then they are also homophones (and homonyms) – for example, bark (the sound of a dog) and bark (the skin of a tree). If they are pronounced differently then they are also heteronyms – for example, bow (the front of a ship) and bow (a ranged weapon).
Homophones (literally "same sound") are usually defined as words that share the same pronunciation, regardless of how they are spelled.[note 2] If they are spelled the same then they are also homographs (and homonyms); if they are spelled differently then they are also heterographs (literally "different writing"). Homographic examples include rose (flower) and rose (past tense of rise). Heterographic examples include to, too, two, and there, their, they’re. Due to their similar yet non-identical pronunciation in American English, ladder and latter do not qualify as homophones, but rather synophones.
Heteronyms (literally "different name") are the subset of homographs (words that share the same spelling) that have different pronunciations (and meanings).[note 3] Such words include desert (to abandon) and desert (arid region); tear (to rip) and tear (a drop of moisture formed in one eye); row (to argue or an argument) and row (as in to row a boat or a row of seats - a pair of homophones). Heteronyms are also sometimes called heterophones (literally "different sound").
Polysemes are words with the same spelling and distinct but related meanings. The distinction between polysemy and homonymy is often subtle and subjective, and not all sources consider polysemous words to be homonyms. Words such as mouth, meaning either the orifice on one's face, or the opening of a cave or river, are polysemous and may or may not be considered homonyms.
Capitonyms are words that share the same spelling but have different meanings when capitalized (and may or may not have different pronunciations). Such words include polish (make shiny) and Polish (from Poland); march (walk in step) and March (the third month of the Year) and the pair: reading (using a book) and Reading (towns in, among other places, England).
A further example of a homonym, which is both a homophone and a homograph, is fluke. Fluke can mean:
These meanings represent at least three etymologically separate lexemes, but share the one form, fluke.* Note that fluke is also a capitonym, in that Fluke Corporation (commonly referred to as simply "Fluke") is a manufacturer of industrial testing equipment.
Similarly, a river bank, a savings bank, a bank of switches, and a bank shot in the game of pool share a common spelling and pronunciation, but differ in meaning.
The words bow and bough are examples where there are two meanings associated with a single pronunciation and spelling (the weapon and the knot); two meanings with two different pronunciations (the knot and the act of bending at the waist), and two distinct meanings sharing the same sound but different spellings (bow, the act of bending at the waist, and bough, the branch of a tree). In addition, it has several related but distinct meanings – a bent line is sometimes called a 'bowed' line, reflecting its similarity to the weapon. Even according to the most restrictive definitions, various pairs of sounds and meanings of bow, Bow and bough are homonyms, homographs, homophones, heteronyms, heterographs, capitonyms and are polysemous.
bow—a weapon to shoot projectiles with (e.g. a bow and arrow)
The words there, their, and they're are examples of three words that are of a singular pronunciation (in American English), have different spellings and vastly different meanings. These three words are commonly misused (or misspelled if you want to look at it that way) in American English.
there - "The bow shot the arrow there.", He said as He pointed. "The bow shot the arrow there.", She said as She pointed.
their - "It was their bow and arrow." the Mother said.
they're - They're not going to get to shoot the bow again after puncturing the tire on Daddy's car. (Contraction of They and Are.)
Homonyms in historical linguistics
Homonymy can lead to communicative conflicts and thus trigger lexical (onomasiological) change. This is known as homonymic conflict.
Synonyms, different words with identical or very similar meanings (conceptual inversion of "homonym")
^Some sources restrict the term "homograph" to words that have the same spelling but different pronunciations. See, for example, The Blackwell Encyclopedia of Writing Systems, p. 215 (Wiley-Blackwell, 1999) and The Encyclopædia Britannica (14th Edition) (entry for "homograph").
^Some sources restrict the term "homophone" to words that have the same pronunciation but different spellings. See, for example, The Blackwell Encyclopedia of Writing Systems, p. 202 (Wiley-Blackwell, 1999) and The Encyclopædia Britannica (14th Edition) (entry for "homograph").
^Some sources do not require that heteronyms have different pronunciations. See, for example, the archived Encarta dictionary entry (which states that heteronyms "often" differ in pronunciation) and the "Fun with Words" website (which states that heteronyms "sometimes" have different pronunciations).
^ abhomonym, Random House Unabridged Dictionary at dictionary.com
^On this phenomenon see Williams, Edna R. (1944), The Conflict of Homonyms in English, [Yale Studies in English 100], New Haven: Yale University Press, Grzega, Joachim (2004), Bezeichnungswandel: Wie, Warum, Wozu? Ein Beitrag zur englischen und allgemeinen Onomasiologie, Heidelberg: Winter, p. 216ff., and Grzega, Joachim (2001d), “Über Homonymenkonflikt als Auslöser von Wortuntergang”, in: Grzega, Joachim (2001c), Sprachwissenschaft ohne Fachchinesisch: 7 aktuelle Studien für alle Sprachinteressierten, Aachen: Shaker, p. 81-98.