growth vs tumor

growth and tumor both are nouns.

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

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

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

growth (noun)	tumor (noun)
the gradual beginning or coming forth	an abnormal new mass of tissue that serves no purpose
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)