vapour bath vs washup

vapour bath and washup both are nouns.

Word	Noun	Adjective	Verb	Adverb
vapour bath	Yes	No	No	No
washup	Yes	No	No	No

As nouns, washup is a hypernym of vapour bath; that is, washup is a word with a broader meaning than vapour bath:

vapour bath: you sweat in a steam room before getting a rubdown and cold shower
washup: the act of washing yourself (or another person)

Other hypernyms of vapour bath include bathing.

vapour bath (noun)	washup (noun)
you sweat in a steam room before getting a rubdown and cold shower	the act of washing yourself (or another person)
a room that can be filled with steam in which people bathe; `vapour bath' is a British term	the act of washing dishes