Christ thorn vs genus Euphorbia

Christ thorn and genus Euphorbia both are nouns.

Word	Noun	Adjective	Verb	Adverb
Christ thorn	Yes	No	No	No
genus Euphorbia	Yes	No	No	No

Christ thorn (noun)	genus Euphorbia (noun)
somewhat climbing bushy spurge of Madagascar having long woody spiny stems with few leaves and flowers with scarlet bracts	type genus of the Euphorbiaceae: very large genus of diverse plants all having milky juice