regulatory gene vs regulator gene

regulatory gene and regulator gene both are nouns.

Word	Noun	Adjective	Verb	Adverb
regulatory gene	Yes	No	No	No
regulator gene	Yes	No	No	No

As nouns, regulatory gene and regulator gene are synonyms defined as:

regulatory gene and regulator gene: a gene that produces a repressor substance that inhibits an operator gene

regulatory gene (noun)	regulator gene (noun)
a gene that produces a repressor substance that inhibits an operator gene	a gene that produces a repressor substance that inhibits an operator gene