noun a sycophantic follower.
2. observer ·noun one who fulfills or performs; as, an observer of his promises.
3. observer ·noun one who keeps any law, custom, regulation, rite, ·etc.; one who conforms to anything in practice.
4. observer ·noun 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.