tussock bellflower vs spreading bellflower

tussock bellflower and spreading bellflower both are nouns.

Word	Noun	Adjective	Verb	Adverb
tussock bellflower	Yes	No	No	No
spreading bellflower	Yes	No	No	No

As nouns, tussock bellflower and spreading bellflower are synonyms defined as:

tussock bellflower and spreading bellflower: European perennial bellflower that grows in clumps with spreading stems and blue or white flowers

Other synonyms of tussock bellflower include Campanula carpatica.

tussock bellflower (noun)	spreading bellflower (noun)
European perennial bellflower that grows in clumps with spreading stems and blue or white flowers	European perennial bellflower that grows in clumps with spreading stems and blue or white flowers