growth vs polypus

growth and polypus both are nouns.

Word	Noun	Adjective	Verb	Adverb
growth	Yes	No	No	No
polypus	Yes	No	No	No

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

Other hyponyms of growth include excrescence, exostosis, polyp, peduncle, neoplasm, tumor, tumour, hamartoma.

growth (noun)	polypus (noun)
the gradual beginning or coming forth	a small vascular growth on the surface of a mucous membrane
vegetation that has grown
something grown or growing
(biology) the process of an individual organism growing organically; a purely biological unfolding of events involved in an organism changing gradually from a simple to a more complex level
a progression from simpler to more complex forms
a process of becoming larger or longer or more numerous or more important
(pathology) an abnormal proliferation of tissue (as in a tumor)