speech vs dialog

speech and dialog both are nouns.

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

speech (noun)	dialog (noun)
the mental faculty or power of vocal communication	the lines spoken by characters in drama or fiction
(language) communication by word of mouth	a conversation between two persons
the act of delivering a formal spoken communication to an audience	a literary composition in the form of a conversation between two people
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