Here's what rhymes with categorizing.
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arriving deriving diving writhing conniving tithing dicing knifing driving surviving pricing thriving slicing striving depriving reviving enticing splicing contriving sacrificing apprenticing streptomycin writing dying fighting lying buying crying firing mining riding acquiring climbing dining filing guiding hiding lighting lining shining timing abiding assigning biting citing hiring liking signing typing gliding piling piping tying wiping wiring dyeing hiking rhyming siding sighing sighting tiring whining alighting aligning colliding pining righting siting vying biding biking chiding fining griping liming whiting shying viking knighting seining tiding wining finding trying binding applying exciting flying smiling combining deciding declining drying lightning sliding winding admiring grinding refining ageing aspiring confining frying obliging ascribing compiling confiding plying priming prying spying undying untiring bribing divining igniting minding perspiring styling twining blighting decrying hireling rifling slighting sniping spiking exiling eliding maligning opining priding retyping swiping providing striking underlying defining describing denying designing dividing occupying supplying gratifying inviting modifying presiding relying residing retiring terrifying trifling uniting blinding justifying overlying overriding reciting undermining coinciding complying conspiring defying edifying expiring inciting inclining reclining resigning rewriting stifling striding underwriting beguiling certifying delighting disliking ratifying subsiding underlining nullifying pacifying repining unsmiling unwinding belying codifying deriding indicting ossifying overwriting typifying unexciting satisfying implying inspiring multiplying reminding specifying clarifying classifying prescribing qualifying reconciling replying signifying unifying horrifying magnifying purifying subscribing testifying verifying amplifying fancying glorifying notifying prophesying rectifying transcribing expediting inscribing intertwining reuniting stultifying stupefying subdividing uninviting acidifying calcifying crucifying enshrining fructifying liquefying personifying proscribing ramifying recombining unedifying identifying stereotyping diversifying quantifying redefining sanctifying beautifying circumscribing emulsifying falsifying mystifying objectifying redesigning solidifying uninspiring vivifying nonbinding putrefying vilifying intensifying simplifying fortifying mortifying unsatisfying disqualifying electrifying exemplifying indemnifying oversimplifying