devil's milk vs Euphorbia peplus

devil's milk and Euphorbia peplus both are nouns.

Word	Noun	Adjective	Verb	Adverb
devil's milk	Yes	No	No	No
Euphorbia peplus	Yes	No	No	No

As nouns, devil's milk and Euphorbia peplus are synonyms defined as:

devil's milk and Euphorbia peplus: an Old World spurge introduced as a weed in the eastern United States

Other synonyms of devil's milk include petty spurge.

devil's milk (noun)	Euphorbia peplus (noun)
not unattractive European weed whose flowers turn toward the sun	an Old World spurge introduced as a weed in the eastern United States
an Old World spurge introduced as a weed in the eastern United States