Definify.com
Webster 1913 Edition
Prowler
Prowl′er
,Noun.
 One that prowls. 
Thomson.
 Webster 1828 Edition
Prowler
PROWL'ER
,Noun.
  Definition 2025
prowler
prowler
English
Noun
prowler (plural prowlers)
-  One who roves about for prey; one who prowls.
-  1922, Michael Arlen, chapter 1/1/2, in “Piracy”: A Romantic Chronicle of These Days:
- House Prees and Bloods […] were everywhere to be seen in earnest colloquy. For the matter was, that there was some sort of night-prowler about the school grounds.
 
 
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References
- prowler in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913