inscribe vs autograph

inscribe is not a noun while autograph is a noun.

Word	Noun	Adjective	Verb	Adverb
inscribe	No	No	Yes	No
autograph	Yes	No	Yes	No

As verbs, inscribe and autograph are synonyms defined as:

inscribe (noun)	autograph (noun)
	something written by one's own hand
	a person's own signature

inscribe (verb)	autograph (verb)
mark with one's signature	mark with one's signature
address, (a work of literature) in a style less formal than a dedication
write, engrave, or print as a lasting record
convert ordinary language into code
carve, cut, or etch into a material or surface
draw within a figure so as to touch in as many places as possible
register formally as a participant or member