練習【れんしゅう】
practice, training, drill, (an) exercise, workout
訓練【くんれん】
training, drill, practice, discipline
試練【しれん】
test, trial, ordeal, tribulation
熟練【じゅくれん】
skill, dexterity, proficiency
未練【みれん】
lingering attachment, lingering affection, regret, reluctance, ruefulness
練る【ねる】
to knead, to thicken into a paste (stirring over a flame), to polish (a plan, etc.), to refine, to elaborate, to work out, to train, to drill, to exercise, to gloss (silk), to soften, to degum, to tan (leather), to temper (steel), to walk in procession, to parade, to march
修練【しゅうれん】
training, drill, practice, practising, discipline
洗練【せんれん】
polish, refinement