gay woman vs dike

gay woman and dike both are nouns.

Word	Noun	Adjective	Verb	Adverb
gay woman	Yes	No	No	No
dike	Yes	No	Yes	No

As nouns, dike is a hyponym of gay woman; that is, dike is a word with a more specific, narrower meaning than gay woman:

Other hyponyms of gay woman include butch, dyke.

gay woman (noun)	dike (noun)
a female homosexual	a barrier constructed to contain the flow of water or to keep out the sea
	(slang) offensive term for a lesbian who is noticeably masculine

gay woman (verb)	dike (verb)
	enclose with a dike