sexless vs neuter

sexless is not a noun while neuter is a noun.

Word	Noun	Adjective	Verb	Adverb
sexless	No	Yes	No	No
neuter	Yes	Yes	Yes	No

As adjectives, sexless and neuter are synonyms defined as:

sexless and neuter: having no or imperfectly developed or nonfunctional sex organs

sexless (noun)	neuter (noun)
	a gender that refers chiefly (but not exclusively) to inanimate objects (neither masculine nor feminine)

sexless (adjective)	neuter (adjective)
sexually unattractive	neither male nor female (of grammatical gender)
having no or imperfectly developed or nonfunctional sex organs	having no or imperfectly developed or nonfunctional sex organs
having no sexual desire

sexless (verb)	neuter (verb)
	remove the ovaries of