Canterbury bell vs cup and saucer

Canterbury bell and cup and saucer both are nouns.

Word	Noun	Adjective	Verb	Adverb
Canterbury bell	Yes	No	No	No
cup and saucer	Yes	No	No	No

As nouns, Canterbury bell and cup and saucer are synonyms defined as:

Canterbury bell and cup and saucer: European biennial widely cultivated for its blue or violet or white flowers

Other synonyms of Canterbury bell include Campanula medium.

Canterbury bell (noun)	cup and saucer (noun)
herb of Colombia to Peru having pale purple flowers	European biennial widely cultivated for its blue or violet or white flowers
European biennial widely cultivated for its blue or violet or white flowers