astasia vs impairment

astasia and impairment both are nouns.

Word	Noun	Adjective	Verb	Adverb
astasia	Yes	No	No	No
impairment	Yes	No	No	No

As nouns, impairment is a hypernym of astasia; that is, impairment is a word with a broader meaning than astasia:

astasia: inability to stand due to muscular incoordination
impairment: the condition of being unable to perform as a consequence of physical or mental unfitness

Other hypernyms of astasia include disability, disablement, handicap.

astasia (noun)	impairment (noun)
inability to stand due to muscular incoordination	damage that results in a reduction of strength or quality
	the act of making something futile and useless (as by routine)
	the occurrence of a change for the worse
	the condition of being unable to perform as a consequence of physical or mental unfitness
	a symptom of reduced quality or strength