japanese clover vs jap clover

japanese clover and jap clover both are nouns.

Word	Noun	Adjective	Verb	Adverb
japanese clover	Yes	No	No	No
jap clover	Yes	No	No	No

As nouns, japanese clover and jap clover are synonyms defined as:

japanese clover and jap clover: an annual of tropical Asia naturalized in United States

Other synonyms of japanese clover include japan clover, Lespedeza striata.

japanese clover (noun)	jap clover (noun)
an annual of tropical Asia naturalized in United States	an annual of tropical Asia naturalized in United States