windmill grass vs creeping windmill grass

windmill grass and creeping windmill grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
windmill grass	Yes	No	No	No
creeping windmill grass	Yes	No	No	No

As nouns, windmill grass and creeping windmill grass are synonyms defined as:

windmill grass and creeping windmill grass: perennial Australian grass having numerous long spikes arranged like the vanes of a windmill

Other synonyms of windmill grass include Chloris truncata, star grass.

windmill grass (noun)	creeping windmill grass (noun)
perennial Australian grass having numerous long spikes arranged like the vanes of a windmill	perennial Australian grass having numerous long spikes arranged like the vanes of a windmill