papovavirus vs polyoma

papovavirus and polyoma both are nouns.

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

As nouns, polyoma is a hyponym of papovavirus; that is, polyoma is a word with a more specific, narrower meaning than papovavirus:

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

Other hyponyms of papovavirus include human papilloma virus, polyoma virus.

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