sentinel

As nouns the difference between sentinel and defy

is that sentinel is a sentry or guard while defy is (obsolete) a challenge.

As verbs the difference between sentinel and defy

is that sentinel is to watch over as a guard while defy is to renounce or dissolve all bonds of affiance, faith, or obligation with; to reject, refuse, or renounce.

As nouns the difference between warrior and sentinel

is that warrior is a person who is actively engaged in battle, conflict or warfare; a soldier or combatant while sentinel is a sentry or guard.

As a verb sentinel is

to watch over as a guard.

As a noun sentinel

is a sentry or guard.

As a verb sentinel

is to watch over as a guard.

As an adjective undefined is

lacking a definition or value.

In transitive terms the difference between sentinel and prime

is that sentinel is to post a guard for while prime is to apply a coat of primer paint to.

As an adjective prime is

first in importance, degree, or rank.

As nouns the difference between sentinel and humanoid

is that sentinel is a sentry or guard while humanoid is a being having the appearance or characteristics of a human.

As a verb sentinel

is to watch over as a guard.

As an adjective humanoid is

having the appearance or characteristics of a human.

Watchdog is a related term of sentinel.

As nouns the difference between watchdog and sentinel

is that watchdog is a guard dog while sentinel is a sentry or guard.

As verbs the difference between watchdog and sentinel

is that watchdog is to perform a function analogous to that of a watchdog; to guard and warn while sentinel is to watch over as a guard.

As nouns the difference between doorman and sentinel

is that doorman is a man who holds open the door at the entrance to a building, summons taxicabs, and provides an element of security; in apartment buildings, he also accepts deliveries and may perform certain concierge type services while sentinel is a sentry or guard.

As a verb sentinel is

to watch over as a guard.

As nouns the difference between sentinel and angel

is that sentinel is a sentry or guard while angel is a divine and supernatural messenger from a deity, or other divine entity.

As verbs the difference between sentinel and angel

is that sentinel is to watch over as a guard while angel is to support by donating money.

As a proper noun Angel is

a given name derived from Ancient Greek used since 16th century, from Latin Angelus or an anglicized spelling of Ángel.

As nouns the difference between sentinel and saint

is that sentinel is a sentry or guard while saint is a person to whom a church or another religious group has officially attributed the title of "saint"; a holy or godly person; one eminent for piety and virtue.

As verbs the difference between sentinel and saint

is that sentinel is to watch over as a guard while saint is to canonize, to formally recognize someone as a saint.

As nouns the difference between sentinel and watchman

is that sentinel is a sentry or guard while watchman is one set to watch; a person who keeps guard, especially one who guards a building, or the streets of a city, by night.

As a verb sentinel

is to watch over as a guard.