prominent vs salient

prominent is not a noun while salient is a noun.

Word	Noun	Adjective	Verb	Adverb
prominent	No	Yes	No	No
salient	Yes	Yes	No	No

As adjectives, prominent and salient are synonyms defined as:

prominent and salient: having a quality that thrusts itself into attention

Other synonyms of prominent include outstanding, spectacular, striking.

prominent (noun)	salient (noun)
	(military) the part of the line of battle that projects closest to the enemy

prominent (adjective)	salient (adjective)
having a quality that thrusts itself into attention	(of angles) pointing outward at an angle of less than 180 degrees
conspicuous in position or importance	having a quality that thrusts itself into attention
	represented as leaping (rampant but leaning forward)