smilo grass vs ricegrass

smilo grass and ricegrass both are nouns.

Word	Noun	Adjective	Verb	Adverb
smilo grass	Yes	No	No	No
ricegrass	Yes	No	No	No

As nouns, ricegrass is a hypernym of smilo grass; that is, ricegrass is a word with a broader meaning than smilo grass:

smilo grass: perennial mountain rice native to Mediterranean region and introduced into North America
ricegrass: any grass of the genus Oryzopsis

Other hypernyms of smilo grass include rice grass.

smilo grass (noun)	ricegrass (noun)
perennial mountain rice native to Mediterranean region and introduced into North America	any grass of the genus Oryzopsis