cuckoo bread vs wood sorrel

cuckoo bread and wood sorrel both are nouns.

Word	Noun	Adjective	Verb	Adverb
cuckoo bread	Yes	No	No	No
wood sorrel	Yes	No	No	No

As nouns, wood sorrel is a hypernym of cuckoo bread; that is, wood sorrel is a word with a broader meaning than cuckoo bread:

cuckoo bread: Eurasian plant with heart-shaped trifoliate leaves and white purple-veined flowers
wood sorrel: any plant or flower of the genus Oxalis

Other hypernyms of cuckoo bread include oxalis, sorrel.

cuckoo bread (noun)	wood sorrel (noun)
Eurasian plant with heart-shaped trifoliate leaves and white purple-veined flowers	any plant or flower of the genus Oxalis