peach bell vs bellflower

peach bell and bellflower both are nouns.

Word	Noun	Adjective	Verb	Adverb
peach bell	Yes	No	No	No
bellflower	Yes	No	No	No

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

peach bell: perennial European bellflower with racemose white or blue flowers
bellflower: any of various plants of the genus Campanula having blue or white bell-shaped flowers

Other hypernyms of peach bell include campanula.

peach bell (noun)	bellflower (noun)
perennial European bellflower with racemose white or blue flowers	any of various plants of the genus Campanula having blue or white bell-shaped flowers