genus Xanthorroea vs grass tree

genus Xanthorroea and grass tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Xanthorroea	Yes	No	No	No
grass tree	Yes	No	No	No

genus Xanthorroea (noun)	grass tree (noun)
grass trees; sometimes placed in family Xanthorrhoeaceae	any of several Australian evergreen perennials having short thick woody stems crowned by a tuft of grasslike foliage and yielding acaroid resins
	gaunt Tasmanian evergreen shrubby tree with slender tapering leaves 3 to 5 feet long
	elegant tree having either a single trunk or a branching trunk each with terminal clusters of long narrow leaves and large panicles of fragrant white, yellow or red flowers; New Zealand