retirement benefit vs retirement pension

retirement benefit and retirement pension both are nouns.

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

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

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

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

retirement benefit (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