Strong's H4301מַטְמוֹן: a secret storehouse; hence, a secreted valuable (buried); generally money KJV:hidden riches, (hid) treasure(-s).
Meanings: Brown-Driver-Briggs (1906) and Strong's Hebrew Dictionary (1890), public domain, via the Open Scriptures Hebrew Bible Project (CC BY 4.0). TWOT numbers for reference only.
Root family 811: טָמַןṭāman — hide, conceal; hiding, concealing, secretly laying, that which is darkened, darkness; hide thyself in the dust; covering; lay privily, in secret