script vs screenplay

script and screenplay both are nouns.

Word	Noun	Adjective	Verb	Adverb
script	Yes	No	Yes	No
screenplay	Yes	No	No	No

As nouns, screenplay is a hyponym of script; that is, screenplay is a word with a more specific, narrower meaning than script:

script: a written version of a play or other dramatic composition; used in preparing for a performance
screenplay: a script for a film including dialogue and descriptions of characters and sets

script (noun)	screenplay (noun)
a written version of a play or other dramatic composition; used in preparing for a performance	a script for a film including dialogue and descriptions of characters and sets
a particular orthography or writing system
something written by hand

script (verb)	screenplay (verb)
write a script for