1) Concealed one 2) Huntee in a game 3) One in ambush 4) One in camouflage 5) One in concealment 6) One with a secret 7) Person in concealment 8) Playground quarry 9) Secreter 10) Sheltering sort 11) Skinner 12) Stash cacher 13) Stowaway 14) Undercover one 15) What It is looking for 16) Whom the seeker seeks 1) Concealer 
• (n.) One who hides or conceals.
Hid'er noun One who hides or conceals.