Open English Wordnet
Nouns
Verbs
(v)chew over, think over, meditate, ponder, excogitate, contemplate, muse, reflect, mull, mull over, ruminate, speculatereflect deeply on a subject“I mulled over the events of the afternoon”, “philosophers have speculated on the question of God for thousands of years”, “The scientist must stop to observe and start to excogitate”