polyoma virus vs polyoma

polyoma virus and polyoma both are nouns.

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

As nouns, polyoma virus and polyoma are synonyms defined as:

polyoma virus and polyoma: a virus that can initiate various kinds of tumors in mice

polyoma virus (noun)	polyoma (noun)
a virus that can initiate various kinds of tumors in mice	a virus that can initiate various kinds of tumors in mice