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