predominant vs preponderating

predominant and preponderating both are adjectives.

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

As adjectives, predominant and preponderating are synonyms defined as:

Other synonyms of predominant include overriding, paramount, predominate, preponderant.

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