pension fund vs monetary fund

pension fund and monetary fund both are nouns.

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

As nouns, monetary fund is a hypernym of pension fund; that is, monetary fund is a word with a broader meaning than pension fund:

pension fund: a fund reserved to pay workers' pensions when they retire from service
monetary fund: a reserve of money set aside for some purpose

Other hypernyms of pension fund include fund.

pension fund (noun)	monetary fund (noun)
a financial institution that collects regular contributions from employers to provide retirement income for employees	a reserve of money set aside for some purpose
a fund reserved to pay workers' pensions when they retire from service