am

Final position（尾）：am, bam, dam, jam, yam, ham, sham, cam, clam, slam, scam, spam, ram, cram, scram, gram, milligram, program, diagram, swam, wham, tram, exam

Initial/Medial position（首/中）：ambient, ambulance, amp, amplify, ampersand, ambush, amber, ambassador, ambition, ambiguous, campus, camp, lamp, ramp, damp, vamp, stamp, clamp, cramp, tramp, champ, champion, ample, sample, example, scramble, ramble, gamble, campaign, champion, clamber, hamburger, hamper, tamper, pamper, pamphlet, vampire, bamboo, shampoo, shamrock, gambit, rampant