ABC vs script

ABC and script both are nouns.

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

As nouns, script is a hypernym of ABC; that is, script is a word with a broader meaning than ABC:

Other hypernyms of ABC include character set.

ABC (noun)	script (noun)
a character set that includes letters and is used to write a language	a written version of a play or other dramatic composition; used in preparing for a performance
	a particular orthography or writing system
	something written by hand

ABC (verb)	script (verb)
	write a script for