prevalent vs dominant

prevalent is not a noun while dominant is a noun.

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

As adjectives, prevalent and dominant are synonyms defined as:

Other synonyms of prevalent include predominant, prevailing, rife.

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

prevalent (adjective)	dominant (adjective)
most frequent or common	exercising influence or control
	(of genes) producing the same phenotype whether its allele is identical or dissimilar
	most frequent or common