canary grass vs birdseed grass

canary grass and birdseed grass both are nouns.

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

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

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

Other synonyms of canary grass include Phalaris canariensis.

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