Three Syllables
acetic, aesthetic, ascetic, athletic, cosmetic, emetic, frenetic, genetic, kinetic, magnetic, pathetic, phonetic, poetic, prophetic, prosthetic, synthetic, acetic
Four Syllables
alphabetic, anesthetic, apathetic, arithmetic, bionetic, diabetic, dietetic, diuretic, empathetic, energetic, homiletic, kinesthetic, sympathetic