mediacy vs indirectness

mediacy and indirectness both are nouns.

Word	Noun	Adjective	Verb	Adverb
mediacy	Yes	No	No	No
indirectness	Yes	No	No	No

As nouns, indirectness is a hypernym of mediacy; that is, indirectness is a word with a broader meaning than mediacy:

mediacy: the quality of being mediate
indirectness: having the characteristic of lacking a true course toward a goal

mediacy (noun)	indirectness (noun)
the quality of being mediate	having the characteristic of lacking a true course toward a goal