observer

As nouns the difference between watchdog and observer

is that watchdog is a guard dog while observer is one who makes observations, monitors or takes notice.

As a verb watchdog

is to perform a function analogous to that of a watchdog; to guard and warn.

Judge is a related term of observer.

As a proper noun judge

is .

As a noun observer is

one who makes observations, monitors or takes notice.

Investigator is a related term of observer.

As nouns the difference between investigator and observer

is that investigator is one who investigates while observer is one who makes observations, monitors or takes notice.

Evaluator is a related term of observer.

As nouns the difference between evaluator and observer

is that evaluator is agent noun of evaluate; one who evaluates while observer is one who makes observations, monitors or takes notice.

As nouns the difference between estimator and observer

is that estimator is a person who estimates, especially one who estimates costs while observer is one who makes observations, monitors or takes notice.

As nouns the difference between viewer and observer

is that viewer is someone that views some spectacle; an onlooker or spectator while observer is one who makes observations, monitors or takes notice.

Observer is a related term of tester.

As nouns the difference between observer and tester

is that observer is one who makes observations, monitors or takes notice while tester is a canopy over a bed or tester can be a person who administers a test or tester can be an old french silver coin.

As nouns the difference between observee and observer

is that observee is one who is observed while observer is one who makes observations, monitors or takes notice.