preponderating vs dominant

preponderating is not a noun while dominant is a noun.

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

preponderating (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

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