superscript vs adscript

superscript is a noun but adscript is not a noun.

Word	Noun	Adjective	Verb	Adverb
superscript	Yes	Yes	No	No
adscript	No	Yes	No	No

superscript (noun)	adscript (noun)
a character or symbol set or printed or written above and immediately to one side of another character

superscript (adjective)	adscript (adjective)
written or printed above and to one side of another character	written or printed immediately following another character and aligned with it
	(used of persons) bound to a tract of land; hence their service is transferable from owner to owner