polyoma virus vs papovavirus

polyoma virus and papovavirus both are nouns.

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

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

polyoma virus: 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 virus (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