rampion vs bellflower

rampion and bellflower both are nouns.

Word	Noun	Adjective	Verb	Adverb
rampion	Yes	No	No	No
bellflower	Yes	No	No	No

As nouns, bellflower is a hypernym of rampion; that is, bellflower is a word with a broader meaning than rampion:

rampion: bellflower of Europe and Asia and North Africa having bluish flowers and an edible tuberous root used with the leaves in salad
bellflower: any of various plants of the genus Campanula having blue or white bell-shaped flowers

Other hypernyms of rampion include campanula.

rampion (noun)	bellflower (noun)
bellflower of Europe and Asia and North Africa having bluish flowers and an edible tuberous root used with the leaves in salad	any of various plants of the genus Campanula having blue or white bell-shaped flowers