birdseed grass vs canary grass

birdseed grass and canary grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
birdseed grass	Yes	No	No	No
canary grass	Yes	No	No	No

As nouns, birdseed grass and canary grass are synonyms defined as:

birdseed grass and canary grass: Canary Islands grass; seeds used as feed for caged birds

Other synonyms of birdseed grass include Phalaris canariensis.

birdseed grass (noun)	canary grass (noun)
Canary Islands grass; seeds used as feed for caged birds	Canary Islands grass; seeds used as feed for caged birds