Nipponese vs Jap

Nipponese and Jap both are nouns.

Word	Noun	Adjective	Verb	Adverb
Nipponese	Yes	Yes	No	No
Jap	Yes	No	No	No

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

Other hyponyms of Nipponese include Ryukyuan, Nip, geisha, geisha girl, shogun.

Nipponese (noun)	Jap (noun)
a native or inhabitant of Japan	(offensive slang) offensive term for a person of Japanese descent

Nipponese (adjective)	Jap (adjective)
of or relating to or characteristic of Japan or its people or their culture or language