arioso vs recitative

arioso and recitative both are nouns.

Word	Noun	Adjective	Verb	Adverb
arioso	Yes	No	No	No
recitative	Yes	No	No	No

As nouns, recitative is a hypernym of arioso; that is, recitative is a word with a broader meaning than arioso:

arioso: (music) a short recitative that is melodic but is not an aria
recitative: a vocal passage of narrative text that a singer delivers with natural rhythms of speech

arioso (noun)	recitative (noun)
(music) a short recitative that is melodic but is not an aria	a vocal passage of narrative text that a singer delivers with natural rhythms of speech