birdseed grass vs Phalaris canariensis

birdseed grass and Phalaris canariensis both are nouns.

Word	Noun	Adjective	Verb	Adverb
birdseed grass	Yes	No	No	No
Phalaris canariensis	Yes	No	No	No

As nouns, birdseed grass and Phalaris canariensis are synonyms defined as:

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

Other synonyms of birdseed grass include canary grass.

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