public treasury vs treasury

public treasury and treasury both are nouns.

Word	Noun	Adjective	Verb	Adverb
public treasury	Yes	No	No	No
treasury	Yes	No	No	No

As nouns, treasury is a hypernym of public treasury; that is, treasury is a word with a broader meaning than public treasury:

Other hypernyms of public treasury include exchequer.

public treasury (noun)	treasury (noun)
a treasury for government funds	a depository (a room or building) where wealth and precious objects can be kept safely
	the government department responsible for collecting and managing and spending public revenues
	the funds of a government or institution or individual