Observer
King James Dictionary [1]
Observ'Er, n. s as z.
1. One who observes one that takes notice particularly, one who looks to with care, attention or vigilance.
Careful observers may foretell the hour, by sure prognostic, when to dread a shower.
Creditors are great observers of set days and times.
2. A beholder a looker on a spectator. 3. One who keeps any law, custom, regulation or rite one who adheres to any thing in practice one who performs as a great observer of forms an observer of old customs. 4. One who fulfills or performs as, he is a strict observer of his word or promise. 5. One who keeps religiously as an observer of the sabbath.
Webster's Dictionary [2]
(1): ( n.) One who fulfills or performs; as, an observer of his promises.
(2): ( n.) One who observes, or pays attention to, anything; especially, one engaged in, or trained to habits of, close and exact observation; as, an astronomical observer.
(3): ( n.) One who keeps any law, custom, regulation, rite, etc.; one who conforms to anything in practice.
(4): ( n.) A sycophantic follower.