prowler

Plural: prowlers

Noun

• One who moves about stealthily, often with bad intentions.
• someone who prowls or sneaks about; usually with unlawful intentions
• One who roves about for prey; one who prowls.
• A person who moves stealthily around a place with intention to commit a crime, especially burglary or theft.

Examples

• The Words With Friends prowler always found a way to capitalize on obscure two-letter words.

Synonyms

sneak, stalker