snatcher

nouns

a thief who grabs and runs
"a purse snatcher"
snatcher
is derived from
snatch
is a type of (narrower)
a criminal who takes property belonging to someone else with the intention of keeping it or selling it
stealer, thief
someone who unlawfully seizes and detains a victim (usually for ransom)
abductor, kidnaper, kidnapper, snatcher
is derived from
snatch