smilo grass vs rice grass

smilo grass and rice grass both are nouns.

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

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

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

Other hypernyms of smilo grass include ricegrass.

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