campanula vs bellflower

campanula and bellflower both are nouns.

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

As nouns, campanula and bellflower are synonyms defined as:

campanula and bellflower: any of various plants of the genus Campanula having blue or white bell-shaped flowers

campanula (noun)	bellflower (noun)
any of various plants of the genus Campanula having blue or white bell-shaped flowers	any of various plants of the genus Campanula having blue or white bell-shaped flowers