hangover vs uncomfortableness

hangover and uncomfortableness both are nouns.

Word	Noun	Adjective	Verb	Adverb
hangover	Yes	No	No	No
uncomfortableness	Yes	No	No	No

As nouns, uncomfortableness is a hypernym of hangover; that is, uncomfortableness is a word with a broader meaning than hangover:

hangover: disagreeable aftereffects from the use of drugs (especially alcohol)
uncomfortableness: the state of being tense and feeling pain

Other hypernyms of hangover include discomfort.

hangover (noun)	uncomfortableness (noun)
something that has survived from the past	embarrassment deriving from the feeling that others are critically aware of you
an official who remains in office after his term	the state of being tense and feeling pain
disagreeable aftereffects from the use of drugs (especially alcohol)