adenomatous polyp vs polypus

adenomatous polyp and polypus both are nouns.

Word	Noun	Adjective	Verb	Adverb
adenomatous polyp	Yes	No	No	No
polypus	Yes	No	No	No

As nouns, polypus is a hypernym of adenomatous polyp; that is, polypus is a word with a broader meaning than adenomatous polyp:

adenomatous polyp: a polyp that consists of benign neoplastic tissue derived from glandular epithelium
polypus: a small vascular growth on the surface of a mucous membrane

Other hypernyms of adenomatous polyp include polyp.

adenomatous polyp (noun)	polypus (noun)
a polyp that consists of benign neoplastic tissue derived from glandular epithelium	a small vascular growth on the surface of a mucous membrane