indefinability vs indeterminacy

indefinability and indeterminacy both are nouns.

Word	Noun	Adjective	Verb	Adverb
indefinability	Yes	No	No	No
indeterminacy	Yes	No	No	No

As nouns, indeterminacy is a hypernym of indefinability; that is, indeterminacy is a word with a broader meaning than indefinability:

indefinability: The quality of not being able to be precisely defined or put into words.
indeterminacy: the quality of being vague and poorly defined

Other hypernyms of indefinability include indefiniteness, indefinity, indeterminateness, indetermination, inability, unfitness.

indefinability (noun)	indeterminacy (noun)
The quality of not being able to be precisely defined or put into words.	the quality of being vague and poorly defined