backbite
beef
bellyache
bemoan
bewail
bitch
bleat
crab
croak
deplore
gnarl
gripe
grizzle
grouch
grouse
grumble
henpeck
holler
inveigh
lament
murmur
mutter
nag
peck
protest
rail
repine
report
scold
squawk
whine
yammer
yawp