Words in English with the suffix-onym (from the Greek for "name") refer to words with a particular property. For example an acronym is a word formed from the initial letters of other words. Some words have the -nym form rather than the -onym form, such as "ananym" or "hypernym", but that may be more for ease of pronunciation than for etymological reasons.
These words may be freely created, sometimes for no other reason than to give an erudite impression of the user who expects his listeners to understand Greek, and it is in this way that words such as "ornithonym" or "ichthyonym" may be formed.
A list of -onym words
acronym: a word formed from the initials of one or more words that is pronounceable like a normal word, such as NATO, sometimes in distinction to initialism
allonym: an author's name of another person's, often a well-known person's name
anacronym: an acronym that is so well established that its origin as an abbreviation is no longer widely known (a portmanteau of anachronism + acronym)
ananym : a name written backward and used as a pseudonym
andronym : a name that is generally for a male (i.e. John, Daniel, Michael) (see gynonym)
anonym : something created anonymously, or its creator; an unknown author; a pseudonym
anthroponym : a classical compound word denoting a human name
antonym: a word with the exact opposite meaning of another word; an antithesis: "high" and "low" are antonyms (compare with "synonym")
aptronym: a name appropriate to its owner's occupation or physical properties, such as "Goldsmith" or "Longman" (compare with "charactonym")
aristonym: a name derived from a high rank or a title of nobility
backronym: an ordinary word understood as an amusing or ironic acronym (a portmanteau of back + acronym), such as Fiat understood as "Fix It Again Tomorrow"
caconym : a word that is wrongly applied; a misnomer; the incorrect name for something, especially in the classification of plants, etc (compare with euonym).
capitonym: a word that changes its pronunciation and meaning when it is capitalized, such as August — august or Polish — polish
charactonym: a name of a fictional character reflected in his personality traits, such as Shakespeare's Pistol or Bottom (compare with "aptronym")
contronym: a word that may have opposite meanings in different contexts, such as cleave meaning "stick together" or "split apart"
cryptonym: a code name; a word or name used clandestinely to refer to another name or word
demonym: a name of people that refers to the place they come from, such as the "Assyrian", or the "Briton"
eponym: a botanical, zoological, artwork, or place name that derives from a real or legendary person; a name for a real or hypothetical person from whom a botanical, geographical, artwork or zoological name is derived; a person after whom a medical condition is named, or the condition so named
ethnonym : a name of an ethnic group
euonym : a word well suited to a person, place or thing so named; a pleasant name (compare "caconym")
exonym : a name used by one group of people for another group, but who call themselves by a different name, such as "Germans" for "Deutsche"; a place name used by one group that differs from the name used by the people who live there, such as "Cologne" for "Köln"
gynonym : a name that is generally for a female (i.e. Nicole, Heather, Kaitlyn) (see andronym)
heteronym: a word that is spelled in the same way as another but that has a different sound and meaning, for example "bow" as in "bow of a ship" or "bow and arrow" (compare "homonyn")
holonym : a word for the whole of which other words are part, in the way house contains roof, door and window; or car contains steering-wheel and engine (compare "meronym")
homonym: a word that is pronounced and spelled the same way as another, but has a different meaning, such as bat as in "fruit bat" or "bat and ball" (compare "heteronym", "isonym")
hydronym : a name of a body of water
hypernym or hyperonym: a generic word that stands for a class or group of equally-ranked items, such as "tree" for "beech" or "elm", or "house" for "chalet" or "bungalow". A hypernym is said to be "superordinate" to hyponym.
hyponym: an item that belongs to and is equally-ranked in a generic class or group, for example "lily" or "violet" in the class of "flowers"; or "limousine" or "hatchback" in the class of "automobiles". A hyponym is said to be "subordinate" to hypernym.
isonym : a word that is spelt the same as another word but sounds differently; or is of the same derivation as another and is therefore a cognate of that word (compare "homonym", "heteronym")
meronym : a word that names a part that belongs to and is therefore subordinate to a larger entity; a part-whole relationship, such as "door" or "window" in "house", or "engine" or "steering-wheel" in "car" (compare "holonym")
metonym: a word that substitutes a part for the whole it is associated with, for example "crown" for "monarch"; metonymy is the figure of speech incorporating a metonym
paronym: a word that is related to another word and derives from the same root; a cognate word, such as dubious and doubtful
patronym or patronymic; a name adopted from the father's or ancestor's name, for example "Johnson" from "John", "MacDonald" from "Donald", "O'Brien" from "Brien", or "Ivanovich" from "Ivan"
pseudonym: a false and fictitious name, especially one adopted by an author; a pen name
retronym: a compound or modified noun that replaces an original simple noun, for example "analog watch" now means what "watch" used to mean before the invention of the digital watch
synonym: a word equivalent in meaning or nearly so to another word; a word that may be substituted for another word that has the same or a similar meaning, such as near and close (compare "antonym")
troponym ; a verb that indicates more precisely the manner of doing something by its replacing a verb of a more generalized meaning, for example "strolling" is a leisurely manner of "walking"
