poliovirus vaccine vs vaccinum

poliovirus vaccine and vaccinum both are nouns.

Word	Noun	Adjective	Verb	Adverb
poliovirus vaccine	Yes	No	No	No
vaccinum	Yes	No	No	No

As nouns, vaccinum is a hypernym of poliovirus vaccine; that is, vaccinum is a word with a broader meaning than poliovirus vaccine:

poliovirus vaccine: vaccine prepared from poliovirus to provide immunity to poliomyelitis
vaccinum: immunogen consisting of a suspension of weakened or dead pathogenic cells injected in order to stimulate the production of antibodies

Other hypernyms of poliovirus vaccine include vaccine.

poliovirus vaccine (noun)	vaccinum (noun)
vaccine prepared from poliovirus to provide immunity to poliomyelitis	immunogen consisting of a suspension of weakened or dead pathogenic cells injected in order to stimulate the production of antibodies