impairment vs deterioration

impairment and deterioration both are nouns.

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

As nouns, impairment and deterioration are synonyms defined as:

impairment (noun)	deterioration (noun)
damage that results in a reduction of strength or quality	process of changing to an inferior state
the act of making something futile and useless (as by routine)	a symptom of reduced quality or strength
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