A person who looks out or observes; an observer; a scout; a watchman; (also) a person who makes an inspection or examination of something. Obsolete.

One who beholds, a watcher, looker on, spectator.

With adverbs, forming compound agent nouns corresponding to adverbial combinations of look (see look, v. phrasal verbs 1), as looker-about, looker-…

A female espier.

One who considers. with the eyes.

A person who looks down from above; an onlooker, a spectator. Obsolete.

A person who or thing which regards someone or something (in various senses of the verb).

One who views or looks at something; a beholder. rare.

A person who sees, beholds, or catches sight of something; a casual observer, a spectator.

A person who sees, or looks on at, some scene or occurrence; a beholder, onlooker, observer.

A beholder; a spectator. Obsolete. rare.

Beholder.

An onlooker; a spectator, an observer. Obsolete.

Chiefly literary and poetic. A person who looks at or sees something or someone; an observer.

= spectatress, n.

A female spectator.

An observer, spectator. Obsolete. rare.

An observer or spectator, esp. one who observes carefully or attentively.

One who gives heed or attention; an observer.

One who espies or spies out; †a spy.