endowment vs endowment fund

endowment and endowment fund both are nouns.

Word	Noun	Adjective	Verb	Adverb
endowment	Yes	No	No	No
endowment fund	Yes	No	No	No

As nouns, endowment and endowment fund are synonyms defined as:

endowment and endowment fund: the capital that provides income for an institution

endowment (noun)	endowment fund (noun)
the act of endowing with a permanent source of income	the capital that provides income for an institution
natural abilities or qualities
the capital that provides income for an institution