Sanctioning rhymes with:
functioning, malfunctioning, auctioning, functioning, malfunctioning, sectioning, airconditioning, apportioning, auctioning, auditioning, captioning, cautioning, commissioning, conditioning, cushioning, decommissioning, fashioning, freshening, functioning, malfunctioning, mentioning, motioning, optioning, partitioning, petitioning, positioning, rationing, reconditioning, repositioning, sectioning, stationing, transitioning, vacationing
Sanctioning sounds like:
sanctimonious, sanction's, sanctions, sanctions', sensations