deficiency vs tightness

deficiency and tightness both are nouns.

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

As nouns, tightness is a hyponym of deficiency; that is, tightness is a word with a more specific, narrower meaning than deficiency:

Other hyponyms of deficiency include absence, dearth, famine, shortage, deficit, mineral deficiency, shortness, stringency.

deficiency (noun)	tightness (noun)
lack of an adequate quantity or number	lack of movement or room for movement
the state of needing something that is absent or unavailable	extreme stinginess
	the spatial property of being crowded together
	a tight feeling in some part of the body
	a state occasioned by scarcity of money and a shortage of credit