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