Autumn's rhymes with:
ageratums, argosystems, atoms, bantam's, bantams, biosystems, bottom's, bottoms, cablesystems, customs, ecosystems, items, microsystems, microsystems', mortems, phantoms, quantum's, subsystems, symptoms, system's, systems, systems', techsystems, totems, ultimatums, ultrasystems, victim's, victims
Autumn's sounds like:
adam's, adamcik, adamczak, adamczyk, adamec, adamek, adames, adamik, adamkus, adamowicz, adams, adams', adams's, adamski, addams, adding, additions, 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, awaiting