ambiguous vs ambiguity

ambiguous is not a noun while ambiguity is a noun.

Word	Noun	Adjective	Verb	Adverb
ambiguous	No	Yes	No	No
ambiguity	Yes	No	No	No

ambiguous (noun)	ambiguity (noun)
	unclearness by virtue of having more than one meaning
	an expression whose meaning cannot be determined from its context

ambiguous (adjective)	ambiguity (adjective)
having more than one possible meaning
open to two or more interpretations; or of uncertain nature or significance; or (often) intended to mislead
having no intrinsic or objective meaning; not organized in conventional patterns