dialogue vs speech

dialogue and speech both are nouns.

Word	Noun	Adjective	Verb	Adverb
dialogue	Yes	No	No	No
speech	Yes	No	No	No

dialogue (noun)	speech (noun)
the lines spoken by characters in drama or fiction	the mental faculty or power of vocal communication
a conversation between two persons	(language) communication by word of mouth
a literary composition in the form of a conversation between two people	the act of delivering a formal spoken communication to an audience
a discussion intended to produce an agreement	words making up the dialogue of a play
	a lengthy rebuke
	the exchange of spoken words
	your characteristic style or manner of expressing yourself orally
	something spoken