Answer:

gripes

Answer	Crossword Clue
GRIPES	Complaints
GRIPES	Bellyaches
GRIPES	Acts the bellyacher

GRIPES	Beefs
GRIPES	Crabs
GRIPES	Complains
GRIPES	G.I.'s forte.
GRIPES	Grumbles: Slang.
GRIPES	"The ... of Roth," book about Portnoy?
GRIPES	Kvetches
GRIPES	Acts the curmudgeon