prevailing vs predominant

prevailing and predominant both are adjectives.

Word	Noun	Adjective	Verb	Adverb
prevailing	No	Yes	No	No
predominant	No	Yes	No	No

As adjectives, prevailing and predominant are synonyms defined as:

Other synonyms of prevailing include dominant, prevalent, rife.

prevailing (adjective)	predominant (adjective)
most frequent or common	having superior power and influence
	most frequent or common