English Dictionary

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.
Source : opted (104131)  - auto

One who keeps any law, custom, regulation, rite, etc.; one who conforms to anything in practice.
Source : opted (104132)  - auto

One who fulfills or performs; as, an observer of his promises.
Source : opted (104133)  - auto

A sycophantic follower.
Source : opted (104134)  - auto