superannuation vs oldness

superannuation and oldness both are nouns.

Word	Noun	Adjective	Verb	Adverb
superannuation	Yes	No	No	No
oldness	Yes	No	No	No

As nouns, oldness is a hypernym of superannuation; that is, oldness is a word with a broader meaning than superannuation:

superannuation (noun)	oldness (noun)
the act of discharging someone because of age (especially to cause someone to retire from service on a pension)	the quality of being old; the opposite of newness
the property of being out of date and not current	the opposite of youngness
a monthly payment made to someone who is retired from work