sneaker
snea-ker
noun
A person who moves or acts in a secret, furtive, or stealthy way.
"The security guard caught the sneaker trying to enter."
noun
A soft, comfortable shoe, typically worn for sports or casual activities.
"She prefers wearing sneakers for long walks."
Thesaurus
Synonyms: fink, canary, stoolie, stoolpigeon, stool pigeon, sneak, snitch, snitcher, tennis shoe, gym shoe