knack vs endowment

knack and endowment both are nouns.

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

As nouns, endowment is a hypernym of knack; that is, endowment is a word with a broader meaning than knack:

Other hypernyms of knack include gift, natural endowment, talent.

knack (noun)	endowment (noun)
a special way of doing something	the act of endowing with a permanent source of income
	natural abilities or qualities
	the capital that provides income for an institution