spinous process vs outgrowth

spinous process and outgrowth both are nouns.

Word	Noun	Adjective	Verb	Adverb
spinous process	Yes	No	No	No
outgrowth	Yes	No	No	No

As nouns, outgrowth is a hypernym of spinous process; that is, outgrowth is a word with a broader meaning than spinous process:

spinous process: a process projecting from the vertebra that attaches muscles and ligaments.
outgrowth: a natural prolongation or projection from a part of an organism either animal or plant

Other hypernyms of spinous process include appendage, process.

spinous process (noun)	outgrowth (noun)
a process projecting from the vertebra that attaches muscles and ligaments.	a natural prolongation or projection from a part of an organism either animal or plant
	the gradual beginning or coming forth
	a natural consequence of development