traveller's joy vs clematis

traveller's joy and clematis both are nouns.

Word	Noun	Adjective	Verb	Adverb
traveller's joy	Yes	No	No	No
clematis	Yes	No	No	No

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

traveller's joy: vigorous deciduous climber of Europe to Afghanistan and Lebanon having panicles of fragrant green-white flowers in summer and autumn
clematis: any of various ornamental climbing plants of the genus Clematis usually having showy flowers

traveller's joy (noun)	clematis (noun)
vigorous deciduous climber of Europe to Afghanistan and Lebanon having panicles of fragrant green-white flowers in summer and autumn	any of various ornamental climbing plants of the genus Clematis usually having showy flowers