練 practice

MC REN practices knitting string from Compton all the way to the east coast.

practice ★★★★☆
練 (practice) + 習 (learn) = 練習 (practice)

practice , as in guitar, tennis, or jerking off

training ★★☆☆☆
訓 (kunyomi) + 練 (practice) = 訓練 (training)

training - more serious than 練習； more like for the army or kung fu

sophisticated ★☆☆☆☆
洗 (wash) + 練 (practice) = 洗練された (sophisticated)

senrensareta - literally 'polished.' Like the 'after' version of Eliza Doolittle - rich but also well-mannered. Not like Paris Hilton. I guess 'cosmopolitan sophisticate' is the best English equivalent. Also applies to hi-class things that have been made in a very skillful way.