twilight zone vs equivocalness

twilight zone and equivocalness both are nouns.

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

As nouns, equivocalness is a hypernym of twilight zone; that is, equivocalness 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)
equivocalness: unclearness by virtue of having more than one meaning

Other hypernyms of twilight zone include ambiguity.

twilight zone (noun)	equivocalness (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