public square vs agora

public square and agora both are nouns.

Word	Noun	Adjective	Verb	Adverb
public square	Yes	No	No	No
agora	Yes	No	No	No

As nouns, public square and agora are synonyms defined as:

public square and agora: a place of assembly for the people in ancient Greece

public square (noun)	agora (noun)
a place of assembly for the people in ancient Greece	100 agorot equal 1 shekel in Israel
an open area at the meeting of two or more streets	a place of assembly for the people in ancient Greece
	the marketplace in ancient Greece