cuckoo flower vs Cardamine pratensis

cuckoo flower and Cardamine pratensis both are nouns.

Word	Noun	Adjective	Verb	Adverb
cuckoo flower	Yes	No	No	No
Cardamine pratensis	Yes	No	No	No

As nouns, cuckoo flower and Cardamine pratensis are synonyms defined as:

cuckoo flower and Cardamine pratensis: a bitter cress of Europe and America

Other synonyms of cuckoo flower include cuckooflower, lady's smock, meadow cress.

cuckoo flower (noun)	Cardamine pratensis (noun)
common perennial native to Europe and western Asia having usually pink flowers with ragged petals	a bitter cress of Europe and America
a bitter cress of Europe and America