impairment vs dysomia

impairment and dysomia both are nouns.

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

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

impairment: the condition of being unable to perform as a consequence of physical or mental unfitness
dysomia: impairment of the sense of smell

impairment (noun)	dysomia (noun)
damage that results in a reduction of strength or quality	impairment of the sense of smell
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