WordNet: betrayer, blabber, informer, rat, squealer

one who reveals confidential information in return for money

• hypernym informant, source

• hyponym canary, fink, sneak, sneaker, snitch, snitcher, stool pigeon, stoolie, stoolpigeon

• hyponym copper's nark, nark

• hyponym grass, supergrass

betrayer

• (englanti) betray (derivationally related)

• (englanti) betray (derivationally related)
• (suomi) petturi (synonyymi)

blabber

• (englanti) blab (derivationally related)

• (englanti) blabber (derivationally related)
• (suomi) lavertelija (synonyymi)

• (suomi) lörppö (synonyymi)

informer

• (englanti) inform (derivationally related)
• (suomi) ilmiantaja (synonyymi)

rat

• (englanti) rat (derivationally related)
• (suomi) rotta (synonyymi)

squealer

• (englanti) squeal (derivationally related)
• (suomi) vasikka (synonyymi)