stringency vs lack

stringency and lack both are nouns.

Word	Noun	Adjective	Verb	Adverb
stringency	Yes	No	No	No
lack	Yes	No	Yes	No

As nouns, lack is a hypernym of stringency; that is, lack is a word with a broader meaning than stringency:

stringency: a state occasioned by scarcity of money and a shortage of credit
lack: the state of needing something that is absent or unavailable

Other hypernyms of stringency include deficiency, want.

stringency (noun)	lack (noun)
conscientious attention to rules and details	the state of needing something that is absent or unavailable
a state occasioned by scarcity of money and a shortage of credit

stringency (verb)	lack (verb)
	be without
	To be insufficiently prepared