twilight zone vs ambiguity

twilight zone and ambiguity both are nouns.

Word	Noun	Adjective	Verb	Adverb
twilight zone	Yes	No	No	No
ambiguity	Yes	No	No	No

As nouns, ambiguity is a hypernym of twilight zone; that is, ambiguity is a word with a broader meaning than twilight zone:

twilight zone: the ambiguous region between two categories or states or conditions (usually containing some features of both)
ambiguity: unclearness by virtue of having more than one meaning

Other hypernyms of twilight zone include equivocalness.

twilight zone (noun)	ambiguity (noun)
the ambiguous region between two categories or states or conditions (usually containing some features of both)	unclearness by virtue of having more than one meaning
the lowest level of the ocean to which light can reach	an expression whose meaning cannot be determined from its context