virgin's bower vs clematis

virgin's bower and clematis both are nouns.

Word	Noun	Adjective	Verb	Adverb
virgin's bower	Yes	No	No	No
clematis	Yes	No	No	No

As nouns, clematis is a hypernym of virgin's bower; that is, clematis is a word with a broader meaning than virgin's bower:

virgin's bower: common climber of eastern North America that sprawls over other plants and bears numerous panicles of small creamy white flowers
clematis: any of various ornamental climbing plants of the genus Clematis usually having showy flowers

virgin's bower (noun)	clematis (noun)
common climber of eastern North America that sprawls over other plants and bears numerous panicles of small creamy white flowers	any of various ornamental climbing plants of the genus Clematis usually having showy flowers