Injecting rhymes with:
ejecting, objecting, projecting, rejecting, subjecting, affecting, collecting, connecting, correcting, defecting, deflecting, detecting, directing, disconnecting, disrespecting, dissecting, effecting, ejecting, electing, erecting, expecting, infecting, inspecting, intersecting, neglecting, objecting, perfecting, projecting, prospecting, protecting, recollecting, reconnecting, redirecting, reelecting, reflecting, rejecting, respecting, resurrecting, selecting, subjecting, suspecting, unsuspecting
Injecting sounds like:
immunizations, incidence, incidences, inciting, ingesting, injections, insistence, insisting, instance, instances, instituting, institution's, institutions, institutions'