1) Beef provider 2) Bellyacher 3) Child as stubborn as a mewl 4) Complainer 5) Complaining sort 6) Constant complainer 7) Crybaby 8) Disagreeable person 9) Faultfinder 10) Grumbler 11) Knocker 12) Kvetch 13) Moaner 14) Moaning type 15) Nit-picker 16) One prone to kvetching 17) Poor loser, often 18) Puling person 1) Bellyacher 2) Complainer 3) Crybaby 4) Grumbler 5) Kvetch 6) Moaner 7) Nag 8) Sniveller 9) Squawker 
• (n.) One who, or that which, whines.
Whin'er noun One who, or that which, whines. 
[n] - a person given to excessive complaints and crying and whining
complainer noun a person given to excessive complaints and crying and whining