tumour vs growth

tumour and growth both are nouns.

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

As nouns, growth is a hypernym of tumour; that is, growth is a word with a broader meaning than tumour:

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