spinous process vs appendage

spinous process and appendage both are nouns.

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

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

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

Other hypernyms of spinous process include outgrowth, process.

spinous process (noun)	appendage (noun)
a process projecting from the vertebra that attaches muscles and ligaments.	a part that is joined to something larger
	an external body part that projects from the body
	a natural prolongation or projection from a part of an organism either animal or plant