quarrel1
Pronunciation: /ˈkwɒr(ə)l/
noun
verb ( quarrels, quarrelling, quarrelled; US quarrels, quarreling, quarreled)

Origin:
Middle English (in the sense 'reason for disagreement with a person'): from Old French querele, from Latin querel(l)a 'complaint', from queri 'complain'

Spelling rule
Double the l when adding endings which begin with a vowel to words which end in a vowel plus l (as in travel):