feathertop grass vs Pennistum villosum

feathertop grass and Pennistum villosum both are nouns.

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

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

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

Other synonyms of feathertop grass include feathertop.

feathertop grass (noun)	Pennistum villosum (noun)
northeastern tropical African plant having feathery panicles	northeastern tropical African plant having feathery panicles