protuberant vs bulbous

protuberant and bulbous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
protuberant	No	Yes	No	No
bulbous	No	Yes	No	No

As adjectives, protuberant and bulbous are synonyms defined as:

Other synonyms of protuberant include bellied, bellying, bulging, bulgy.

protuberant (adjective)	bulbous (adjective)
curving outward	curving outward
	shaped like a bulb