dialogue vs playscript

dialogue and playscript both are nouns.

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

As nouns, playscript is a hypernym of dialogue; that is, playscript is a word with a broader meaning than dialogue:

dialogue: the lines spoken by characters in drama or fiction
playscript: a written version of a play or other dramatic composition; used in preparing for a performance

Other hypernyms of dialogue include book, script.

dialogue (noun)	playscript (noun)
the lines spoken by characters in drama or fiction	a written version of a play or other dramatic composition; used in preparing for a performance
a conversation between two persons
a literary composition in the form of a conversation between two people
a discussion intended to produce an agreement