desideratum vs requirement

desideratum and requirement both are nouns.

Word	Noun	Adjective	Verb	Adverb
desideratum	Yes	No	No	No
requirement	Yes	No	No	No

As nouns, requirement is a hypernym of desideratum; that is, requirement is a word with a broader meaning than desideratum:

Other hypernyms of desideratum include essential, necessary, necessity, requisite.

desideratum (noun)	requirement (noun)
something desired as a necessity	something that is required in advance
	required activity
	anything indispensable