polyoma vs papovavirus

polyoma and papovavirus both are nouns.

Word	Noun	Adjective	Verb	Adverb
polyoma	Yes	No	No	No
papovavirus	Yes	No	No	No

As nouns, papovavirus is a hypernym of polyoma; that is, papovavirus is a word with a broader meaning than polyoma:

polyoma: a virus that can initiate various kinds of tumors in mice
papovavirus: any of a group of animal viruses associated with or causing papillomas or polyomas

polyoma (noun)	papovavirus (noun)
a virus that can initiate various kinds of tumors in mice	any of a group of animal viruses associated with or causing papillomas or polyomas