Deadlines rhymes with:
headlines, bloodlines, guidelines, headlines, sidelines, strandlines, airline's, airlines, airlines', baselines, bloodlines, caroline's, coastlines, dateline's, datelines, enterline's, esterline's, felines, frontline's, guidelines, headlines, hemlines, hotlines, lifelines, moneyline's, nightline's, nightlines, online's, outlines, pipeline's, pipelines, pipelines', sidelines, skylines, smithkline's, storylines, strandlines, underlines, villines
Deadlines sounds like:
d'alene's, dalliance, dalonzo, dateline's, datelines, dawdling, daylong, deadliness, dealing, dealings, delancey, delancy, delange, delaying, delling, dellums, delmas, delmonaco, delmonico, delong, detailing, dettling, dialing, dilemmas, dilling, dillon's, dolence, doling, dolinski, dolinsky, dollens, dollins, dooling, dowling, dueling, duling, dulling, dullness, dulmage, dulong, dwelling, dwellings, dylan's, dylans