guard

> guard
(verb)
defend, keep, patrol, protect, safeguard, save, secure, shelter, shield, watch.

> guard
(noun)
aegis, bulwark, custody, defence, palladium, protection, rampart, safeguard, security, shield.
keeper, guardian, patrol, sentinel, sentry, warden, watch, watchman.
conduct, convoy, escort.
attention, care, caution, circumspection, heed, watchfulness.