dearth vs deficiency

dearth and deficiency both are nouns.

Word	Noun	Adjective	Verb	Adverb
dearth	Yes	No	No	No
deficiency	Yes	No	No	No

As nouns, deficiency is a hypernym of dearth; that is, deficiency is a word with a broader meaning than dearth:

Other hypernyms of dearth include lack, want.

dearth (noun)	deficiency (noun)
an insufficient quantity or number	lack of an adequate quantity or number
an acute insufficiency	the state of needing something that is absent or unavailable