niggle — to criticize, especially constantly or repeatedly, in a peevish or petty way; carp: to niggle about the fine points of interpretation; preferring to niggle rather than take steps to correct a situation.
sniggle — to fish for eels by thrusting a baited hook into their lurking places.
Two-syllable rhymes
giggle — to laugh in a silly, often high-pitched way, especially with short, repeated gasps and titters, as from juvenile or ill-concealed amusement or nervous embarrassment.
