Is there a name for a person who peeks?
I have tried looking up merriam-webster for the term "peeker" (as I expected this is a real word), to no avail.
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You could call such a person a peeker because English would allow this usage, that is the adding of -er to most verbs to refer to a person who does the action of the verb.
You could get a better answer if you provided a sentence in which you wish to use 'peeker'.