retirement pension vs retirement benefit

retirement pension and retirement benefit both are nouns.

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

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

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

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

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