public convenience vs wash room

public convenience and wash room both are nouns.

Word	Noun	Adjective	Verb	Adverb
public convenience	Yes	No	No	No
wash room	Yes	No	No	No

As nouns, public convenience and wash room are synonyms defined as:

public convenience and wash room: a toilet that is available to the public

Other synonyms of public convenience include comfort station, convenience, public lavatory, public toilet, restroom, toilet facility.

public convenience (noun)	wash room (noun)
a toilet that is available to the public	a toilet that is available to the public