false oat vs French rye

false oat and French rye both are nouns.

Word	Noun	Adjective	Verb	Adverb
false oat	Yes	No	No	No
French rye	Yes	No	No	No

As nouns, false oat and French rye are synonyms defined as:

false oat and French rye: coarse perennial Eurasian grass resembling oat; found on roadside verges and rough grassland and in hay meadows; introduced in North America for forage

Other synonyms of false oat include Arrhenatherum elatius, evergreen grass, tall meadow grass, tall oat grass.

false oat (noun)	French rye (noun)
coarse perennial Eurasian grass resembling oat; found on roadside verges and rough grassland and in hay meadows; introduced in North America for forage	coarse perennial Eurasian grass resembling oat; found on roadside verges and rough grassland and in hay meadows; introduced in North America for forage