Aptitude rhymes with:
altitude, attitude, certitude, exactitude, gratitude, latitude, multitude, altitude, amplitude, attitude, certitude, exactitude, gratitude, latitude, longitude, magnitude, multitude, servitude, solitude, verisimilitude
Aptitude sounds like:
abad, abadi, abadie, abate, abated, abbado, abbate, abbett, abbitt, abbot, abbott, abboud, abdo, abed, abedi, abet, abetted, abeyta, abid, abide, abided, abode, abood, aboodi, abott, aboud, about, abt, abut, abutted, afoot, aft, apathy, apatite, aphid, appetite, appetito, apt, avid, avitia, avoid, avoided, avowed