Common -onyms:
* Synonym: A word with the same meaning as another word.
* Antonym: A word with the opposite meaning of another word.
* Homonym: A word that sounds the same as another word but has a different meaning and may or may not be spelled the same.
* Acronym: A word formed from the first letters of other words. (e.g., NATO, NASA)
* Pseudonym: A fictitious name used by an author.
* Eponym: A person, place, or thing after whom something is named.
Less common -onyms:
* Heteronym: A word that is spelled the same as another word but pronounced differently and has a different meaning. (e.g., "bow" as in "bow and arrow" vs. "bow" as in "bow down")
* Tonym: A word that is the opposite of another word in a specific context.
* Paronym: A word that sounds like another word but has a different meaning and spelling.
* Metonym: A word that refers to something else that it is closely associated with. (e.g., "The crown" referring to the monarchy)
Other words with "onym":
* Anonymous: Without a name or known identity.
* Onomastics: The study of names.
This is not an exhaustive list, but it gives you a good starting point for exploring words with "-onym".