Injections rhymes with:
interjections, objection's, objections, projections, rejections, affections, collections, complexions, confections, connections, corrections, defections, directions, dissections, election's, elections, erections, imperfections, infections, inflections, inspections, interconnections, interjections, intersections, objection's, objections, predilections, projections, protections, recollections, reflections, rejections, section's, sections, selections
Injections sounds like:
immunizations, incidence, incidences, inciting, ingesting, injecting, insistence, insisting, instance, instances, instituting, institution's, institutions, institutions'