dialog vs literary composition

dialog and literary composition both are nouns.

Word	Noun	Adjective	Verb	Adverb
dialog	Yes	No	No	No
literary composition	Yes	No	No	No

As nouns, literary composition is a hypernym of dialog; that is, literary composition is a word with a broader meaning than dialog:

dialog: a literary composition in the form of a conversation between two people
literary composition: imaginative or creative writing

Other hypernyms of dialog include literary work.

dialog (noun)	literary composition (noun)
the lines spoken by characters in drama or fiction	imaginative or creative writing
a conversation between two persons
a literary composition in the form of a conversation between two people