1) Bellyacher 2) Carper 3) Crier 4) Grouch 5) Grumbler 6) Kvetch 7) Moaner 8) Sniveller 9) Squawker 10) Whiner 1) Bellyacher 2) Crybaby 3) Disagreeable person 4) Faultfinder 5) Grumbler 6) Knocker 7) Member of the cavil-ry 8) Moaner 9) Nit-picker 10) Sniveller 11) Squawker 12) Unpleasant person 13) Whiner 14) Whinger 
• (n.) One who complains or laments; one who finds fault; a murmurer.
Com·plain'er noun One who complains or laments; one who finds fault; a murmurer. Beattie. « Speechless complainer , I will learn thy thought. Shak. »