ragamuffin

n person, esp a small boy, in dirty untidy clothes 衣衫褴褛的人（尤指小男孩）.

radiography, radioisotope, radiologist, radiology, radish, radium, radius, radon, RAF, raffia, raffish, raffishly, raffishness, raffle, raft, rafter, raftered, rag, rag-and-bone man, rag-bag, rage, ragged, raggedly, raggedness, raging, raglan, ragout, rags, ragtag, ragtime, ragweed, ragwort, raid, raider, rail, railhead, railing, raillery, railroad, railway,