Theorizing rhymes with:
authorizing, categorizing, characterizing, circularizing, colorizing, computerizing, demilitarizing, depressurizing, memorizing, mesmerizing, mischaracterizing, pasteurizing, polarizing, popularizing, pressurizing, reauthorizing, satirizing, summarizing, temporizing, terrorizing
Theorizing sounds like:
tarzan's, terrorizing, terseness, thoroughness, thrashing, torching, tracing, tracking, tragicomic, trajan's, trashing, tregoning, trekking, tricking, trojanowski, trojans, trucking, trzcinski