sheep's fescue vs sheep fescue

sheep's fescue and sheep fescue both are nouns.

Word	Noun	Adjective	Verb	Adverb
sheep's fescue	Yes	No	No	No
sheep fescue	Yes	No	No	No

As nouns, sheep's fescue and sheep fescue are synonyms defined as:

sheep's fescue and sheep fescue: cultivated for sheep pasturage in upland regions or used as a lawn grass

Other synonyms of sheep's fescue include Festuca ovina.

sheep's fescue (noun)	sheep fescue (noun)
cultivated for sheep pasturage in upland regions or used as a lawn grass	cultivated for sheep pasturage in upland regions or used as a lawn grass