wire grass vs broom beard grass

wire grass and broom beard grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
wire grass	Yes	No	No	No
broom beard grass	Yes	No	No	No

As nouns, wire grass and broom beard grass are synonyms defined as:

wire grass and broom beard grass: handsome hardy North American grass with foliage turning pale bronze in autumn

Other synonyms of wire grass include Andropogon scoparius, prairie grass, Schizachyrium scoparium.

wire grass (noun)	broom beard grass (noun)
coarse annual grass having fingerlike spikes of flowers; native to Old World tropics; a naturalized weed elsewhere	handsome hardy North American grass with foliage turning pale bronze in autumn
handsome hardy North American grass with foliage turning pale bronze in autumn