Japanese chess vs bromegrass

Japanese chess and bromegrass both are nouns.

Word	Noun	Adjective	Verb	Adverb
Japanese chess	Yes	No	No	No
bromegrass	Yes	No	No	No

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

Japanese chess: grass of Mediterranean and temperate Asia
bromegrass: any of various woodland and meadow grasses of the genus Bromus; native to temperate regions

Other hypernyms of Japanese chess include brome.

Japanese chess (noun)	bromegrass (noun)
grass of Mediterranean and temperate Asia	any of various woodland and meadow grasses of the genus Bromus; native to temperate regions