jap clover vs bush clover

jap clover and bush clover both are nouns.

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

As nouns, bush clover is a hypernym of jap clover; that is, bush clover is a word with a broader meaning than jap clover:

jap clover: an annual of tropical Asia naturalized in United States
bush clover: shrubby or herbaceous plants widely used for forage, soil improvement, and especially hay in southern United States

Other hypernyms of jap clover include lespedeza.

jap clover (noun)	bush clover (noun)
an annual of tropical Asia naturalized in United States	shrubby or herbaceous plants widely used for forage, soil improvement, and especially hay in southern United States