retirement pension vs retirement fund

retirement pension and retirement fund both are nouns.

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

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

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

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

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