feathertop grass vs feathertop

feathertop grass and feathertop both are nouns.

Word	Noun	Adjective	Verb	Adverb
feathertop grass	Yes	No	No	No
feathertop	Yes	No	No	No

As nouns, feathertop grass and feathertop are synonyms defined as:

feathertop grass and feathertop: northeastern tropical African plant having feathery panicles

Other synonyms of feathertop grass include Pennistum villosum.

feathertop grass (noun)	feathertop (noun)
northeastern tropical African plant having feathery panicles	northeastern tropical African plant having feathery panicles
	a variety of reed grass