leather flower vs clematis

leather flower and clematis both are nouns.

Word	Noun	Adjective	Verb	Adverb
leather flower	Yes	No	No	No
clematis	Yes	No	No	No

As nouns, clematis is a hypernym of leather flower; that is, clematis is a word with a broader meaning than leather flower:

leather flower: woody vine of the southern United States having purple or blue flowers with leathery recurved sepals
clematis: any of various ornamental climbing plants of the genus Clematis usually having showy flowers

As nouns, clematis is a hypernym of leather flower; that is, clematis is a word with a broader meaning than leather flower:

leather flower: scandent subshrub of southeastern United States having large red-purple bell-shaped flowers with leathery recurved sepals
clematis: any of various ornamental climbing plants of the genus Clematis usually having showy flowers

leather flower (noun)	clematis (noun)
woody vine of the southern United States having purple or blue flowers with leathery recurved sepals	any of various ornamental climbing plants of the genus Clematis usually having showy flowers
scandent subshrub of southeastern United States having large red-purple bell-shaped flowers with leathery recurved sepals