-onym

Also ‑onymy, ‑onymic, and ‑onymous.

A name.

Greek onuma, name.

The ending principally appears in words that describe kinds of words. See the table below for some examples. Abstract nouns for the state or concept are formed in ‑onymy: homonymy, metonymy, toponymy. Adjectives are formed in ‑onymic or ‑onymous, sometimes both, though the former is rather more common (eponymous, metonymic, synonymous, toponymic).

Examples of words in -onym
All word origins are from Greek.

acronym

a word formed from the initial letters of other words

akron, end, tip

anonym

an anonymous person or publication, or a pseudonym

an‑, without

antonym

a word opposite in meaning to another

anti‑, against

cryptonym

a code name

kruptos, hidden

eponym

a person after whom a discovery, invention, place, or the like is named or thought to be named

epi, upon

heteronym

each of two or more words which are spelled identically but have different sounds and meanings

heteros, other

homonym

each of two or more words having the same spelling or pronunciation but different meanings and origins

homos, same

hyponym

a word of more specific meaning, a subcategory of a more general class

hupo, under

metonym

a word, name, or expression used as a substitute for something else with which it is closely associated

metōnumia, change of name

pseudonym

a fictitious name, especially one used by an author

pseudēs, false

synonym

a word or phrase that means the same as another word or phrase in the same language

sun‑, with

toponym

a place name, especially one derived from a topographical feature

topos, place