Euphorbia villosa vs spurge

Euphorbia villosa and spurge both are nouns.

Word	Noun	Adjective	Verb	Adverb
Euphorbia villosa	Yes	No	No	No
spurge	Yes	No	No	No

As nouns, spurge is a hypernym of Euphorbia villosa; that is, spurge is a word with a broader meaning than Euphorbia villosa:

Euphorbia villosa: a species of perennial, herbaceous plant that is native to Europe
spurge: any of numerous plants of the genus Euphorbia; usually having milky often poisonous juice

Euphorbia villosa (noun)	spurge (noun)
a species of perennial, herbaceous plant that is native to Europe	any of numerous plants of the genus Euphorbia; usually having milky often poisonous juice