Summarizing rhymes with:
memorizing, mesmerizing, authorizing, categorizing, characterizing, circularizing, colorizing, computerizing, demilitarizing, depressurizing, memorizing, mesmerizing, mischaracterizing, pasteurizing, polarizing, popularizing, pressurizing, reauthorizing, satirizing, temporizing, terrorizing, theorizing
Summarizing sounds like:
schneerson's, smirking, synergen's