Euphorbia milii vs spurge

Euphorbia milii and spurge both are nouns.

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

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

Euphorbia milii: somewhat climbing bushy spurge of Madagascar having long woody spiny stems with few leaves and flowers with scarlet bracts
spurge: any of numerous plants of the genus Euphorbia; usually having milky often poisonous juice

Euphorbia milii (noun)	spurge (noun)
somewhat climbing bushy spurge of Madagascar having long woody spiny stems with few leaves and flowers with scarlet bracts	any of numerous plants of the genus Euphorbia; usually having milky often poisonous juice