public lavatory vs convenience

public lavatory and convenience both are nouns.

Word	Noun	Adjective	Verb	Adverb
public lavatory	Yes	No	No	No
convenience	Yes	No	No	No

As nouns, public lavatory and convenience are synonyms defined as:

public lavatory and convenience: a toilet that is available to the public

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

public lavatory (noun)	convenience (noun)
a toilet that is available to the public	a device or control that is very useful for a particular job
	a toilet that is available to the public
	the quality of being useful and convenient
	the state of being suitable or opportune