Vacationing rhymes with:
stationing, airconditioning, apportioning, auctioning, auditioning, captioning, cautioning, commissioning, conditioning, cushioning, decommissioning, fashioning, freshening, functioning, malfunctioning, mentioning, motioning, optioning, partitioning, petitioning, positioning, rationing, reconditioning, repositioning, sanctioning, sectioning, stationing, transitioning
Vacationing sounds like:
vacating, vacations, vasectomies, vastness, vesting, victim's, victimize, victims, victims', visitations, visiting, vocations