script vs scribble

script and scribble both are nouns.

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

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

script (noun)	scribble (noun)
a written version of a play or other dramatic composition; used in preparing for a performance	an aimless drawing
a particular orthography or writing system	poor handwriting
something written by hand

script (verb)	scribble (verb)
write a script for	write down quickly without much attention to detail
	write carelessly