impairment vs harm

impairment and harm both are nouns.

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

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

Other hypernyms of impairment include damage, hurt, scathe.

As nouns, impairment and harm are synonyms defined as:

Other synonyms of impairment include damage.

impairment (noun)	harm (noun)
damage that results in a reduction of strength or quality	the act of damaging something or someone
the act of making something futile and useless (as by routine)	the occurrence of a change for the worse
the occurrence of a change for the worse	any physical damage to the body caused by violence or accident or fracture etc.; the condition of an injury
the condition of being unable to perform as a consequence of physical or mental unfitness
a symptom of reduced quality or strength

impairment (verb)	harm (verb)
	cause or do harm to