hardinggrass vs Harding grass

hardinggrass and Harding grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
hardinggrass	Yes	No	No	No
Harding grass	Yes	No	No	No

As nouns, hardinggrass and Harding grass are synonyms defined as:

hardinggrass and Harding grass: perennial grass of Australia and South Africa; introduced in North America as forage grass

Other synonyms of hardinggrass include Phalaris aquatica, Phalaris tuberosa, toowomba canary grass.

hardinggrass (noun)	Harding grass (noun)
perennial grass of Australia and South Africa; introduced in North America as forage grass	perennial grass of Australia and South Africa; introduced in North America as forage grass