washup vs vapour bath

washup and vapour bath both are nouns.

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

As nouns, vapour bath is a hyponym of washup; that is, vapour bath is a word with a more specific, narrower meaning than washup:

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

Other hyponyms of washup include shower, shower bath, bath, sponge bath, steam bath, Turkish bath, vapor bath.

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