polyp vs sessile polyp

polyp and sessile polyp both are nouns.

Word	Noun	Adjective	Verb	Adverb
polyp	Yes	No	No	No
sessile polyp	Yes	No	No	No

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

Other hyponyms of polyp include adenomatous polyp, pedunculated polyp.

polyp (noun)	sessile polyp (noun)
one of two forms that coelenterates take (e.g. a hydra or coral): usually sedentary with a hollow cylindrical body usually with a ring of tentacles around the mouth	a relatively flat polyp
a small vascular growth on the surface of a mucous membrane