modifier gene vs modifier

modifier gene and modifier both are nouns.

Word	Noun	Adjective	Verb	Adverb
modifier gene	Yes	No	No	No
modifier	Yes	No	No	No

As nouns, modifier gene and modifier are synonyms defined as:

modifier gene and modifier: a gene that modifies the effect produced by another gene

modifier gene (noun)	modifier (noun)
a gene that modifies the effect produced by another gene	a gene that modifies the effect produced by another gene
	a content word that qualifies the meaning of a noun or verb
	a person who changes something
	a moderator who makes less extreme or uncompromising