treasury vs subtreasury

treasury and subtreasury both are nouns.

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

As nouns, subtreasury is a hyponym of treasury; that is, subtreasury is a word with a more specific, narrower meaning than treasury:

Other hyponyms of treasury include public treasury, till, trough, bursary, fisc.

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