geisha vs Japanese

geisha and Japanese both are nouns.

Word	Noun	Adjective	Verb	Adverb
geisha	Yes	No	No	No
Japanese	Yes	Yes	No	No

As nouns, Japanese is a hypernym of geisha; that is, Japanese is a word with a broader meaning than geisha:

geisha: a Japanese woman trained to entertain men with conversation and singing and dancing
Japanese: a native or inhabitant of Japan

Other hypernyms of geisha include Nipponese, adult female, woman.

geisha (noun)	Japanese (noun)
a Japanese woman trained to entertain men with conversation and singing and dancing	the language (usually considered to be Altaic) spoken by the Japanese
	a native or inhabitant of Japan

geisha (adjective)	Japanese (adjective)
	of or relating to or characteristic of Japan or its people or their culture or language