cheat on vs cuckold

cheat on is not a noun while cuckold is a noun.

Word	Noun	Adjective	Verb	Adverb
cheat on	No	No	Yes	No
cuckold	Yes	No	Yes	No

As verbs, cheat on and cuckold are synonyms defined as:

cheat on and cuckold: be sexually unfaithful to one's partner in marriage

Other synonyms of cheat on include betray, cheat, wander.

cheat on (noun)	cuckold (noun)
	a man whose wife committed adultery

cheat on (verb)	cuckold (verb)
be sexually unfaithful to one's partner in marriage	be sexually unfaithful to one's partner in marriage