Additions rhymes with:
expeditions, traditions, auditions, conditions, edition's, editions, expeditions, preconditions, renditions, traditions
Additions sounds like:
adam's, adamcik, adamczak, adamczyk, adamec, adamek, adames, adamik, adamkus, adamowicz, adams, adams', adams's, adamski, addams, adding, admonish, admonishes, adonis, aetna's, aiding, atencio, athanas, athanassiou, athans, athenaios, athenians, athens, atienza, atomic, atoms, attaining, attains, attanasio, audience, audience's, audiences, auditing, auditioning, auditions, autonomic, autonomous, autumn's, awaiting