retirement fund vs retirement pension

retirement fund and retirement pension both are nouns.

Word	Noun	Adjective	Verb	Adverb
retirement fund	Yes	No	No	No
retirement pension	Yes	No	No	No

As nouns, retirement fund and retirement pension are synonyms defined as:

retirement fund and retirement pension: a monthly payment made to someone who is retired from work

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

retirement fund (noun)	retirement pension (noun)
a monthly payment made to someone who is retired from work	a monthly payment made to someone who is retired from work