dominant vs predominant

dominant is a noun but predominant is not a noun.

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

As adjectives, dominant and predominant are synonyms defined as:

Other synonyms of dominant include prevailing, prevalent, rife.

dominant (noun)	predominant (noun)
an allele that produces the same phenotype whether its paired allele is identical or different
(music) the fifth note of the diatonic scale

dominant (adjective)	predominant (adjective)
exercising influence or control	having superior power and influence
(of genes) producing the same phenotype whether its allele is identical or dissimilar	most frequent or common
most frequent or common