harm vs impairment

harm and impairment both are nouns.

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

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

As nouns, harm and impairment are synonyms defined as:

Other synonyms of harm include damage.

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

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