superannuation vs old-age pension

superannuation and old-age pension both are nouns.

Word	Noun	Adjective	Verb	Adverb
superannuation	Yes	No	No	No
old-age pension	Yes	No	No	No

As nouns, superannuation and old-age pension are synonyms defined as:

superannuation and old-age pension: a monthly payment made to someone who is retired from work

Other synonyms of superannuation include retirement benefit, retirement check, retirement fund, retirement pension.

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the property of being out of date and not current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