bends vs unwellness

bends and unwellness both are nouns.

Word	Noun	Adjective	Verb	Adverb
bends	Yes	No	No	No
unwellness	Yes	No	No	No

As nouns, unwellness is a hypernym of bends; that is, unwellness is a word with a broader meaning than bends:

bends: pain resulting from rapid change in pressure
unwellness: impairment of normal physiological function affecting part or all of an organism

Other hypernyms of bends include illness, malady, sickness.

bends (noun)	unwellness (noun)
pain resulting from rapid change in pressure	impairment of normal physiological function affecting part or all of an organism