Japanese vs shogun

Japanese and shogun both are nouns.

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

As nouns, shogun is a hyponym of Japanese; that is, shogun is a word with a more specific, narrower meaning than Japanese:

Japanese: a native or inhabitant of Japan
shogun: a hereditary military dictator of Japan; the shoguns ruled Japan until the revolution of 1867-68

Other hyponyms of Japanese include Ryukyuan, Jap, Nip, geisha, geisha girl.

Japanese (noun)	shogun (noun)
the language (usually considered to be Altaic) spoken by the Japanese	a hereditary military dictator of Japan; the shoguns ruled Japan until the revolution of 1867-68
a native or inhabitant of Japan

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