1) Ache 2) Aching 3) Complain 4) Complain in a whiny manner 5) Complain whiningly, slang 6) Exclusively Saxon word 7) Exclusively Anglo word 8) Gastralgia 9) Gripe 10) Kvetch 11) Stomach ache 12) Stomachache 13) Whine 14) Whine and complain 15) Word of purely Anglo origin 16) Word with Anglo-Saxon origins Found on https://www.crosswordclues.com/clue/bellyache