a tale-bearing animal
betrayer
blab
blabber
blabberer
blabbermouth
busybody
canary
delator
fink
gossip
gossip columnist
gossiper
gossipmonger
informer
narc
nark
newsmonger
newspaperman
peacher
quidnunc
rat
reporter
rumormonger
scandalmonger
sieve
sneak
snitch
snitcher
spy
squealer
stool pigeon
stoolie
tabby
taleteller
tattler
tattletale
telltale
tipster
tittle-tattler
troublemaker
whistle-blower
yenta
rumourmonger
European
absolutist
claimants'
cowan
deceiver
experts'
housebreaker
ill-understood
inequitable
peeper
pointof
sublunary
tempter