guard

[1]	protect , shield , safeguard , (keep/stand) watch (over) , defend , convoy , escort , police , look after , tend , mind
[2]	control , mind
[3]	ward
[4]	defend , hold

[1]	safety , sentinel , watchman , safety device , sentry , security guard , custodian , guardian , protector , picket , watch , bodyguard , evzone , bashibazouk , (Brit) warder , wardress , (Slang) screw , (Brit) minder
[2]	protection , convoy , escort , patrol
[3]	defence , protection , safety , safeguard , security , shield
[4]	precaution , safeguard
[5]	guard duty , sentry duty , sentry go