cactus euphorbia vs spurge

cactus euphorbia and spurge both are nouns.

Word	Noun	Adjective	Verb	Adverb
cactus euphorbia	Yes	No	No	No
spurge	Yes	No	No	No

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

cactus euphorbia: small tree of dry open parts of southern Africa having erect angled branches suggesting candelabra
spurge: any of numerous plants of the genus Euphorbia; usually having milky often poisonous juice

cactus euphorbia (noun)	spurge (noun)
small tree of dry open parts of southern Africa having erect angled branches suggesting candelabra	any of numerous plants of the genus Euphorbia; usually having milky often poisonous juice