public lavatory vs public toilet

public lavatory and public toilet both are nouns.

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

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

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

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

public lavatory (noun)	public toilet (noun)
a toilet that is available to the public	a toilet that is available to the public