1.basically they are identical, but 还 can be used to describe sth in future, in which it means more. eg. 我还要一瓶水。 I want one more glass of water. 2.voice ; sound of a song 3.disc ; album 4.ambitious, always want to win

I think it would be helpful via the following sentences : 1、Would you like anything else to eat? 你想要其它吃的吗？ under the circumstance, we usually add the word "还“,rather than "仍然”， in the front of the word ”想“. so it is changed into this 你还想要其它吃的吗？ 2、He is very young as before.他仍然很年轻。in this case,we only use 仍然 to express. If we use 还 instant of 仍然， it means He is so young that he can live for a long time. hope these idea will work , good luck

仍然：as usual. 还：repeat the same thing. 嗓音：voice. 歌声：sound of music. 唱片：a medium. 专辑：album. 好强：fond of compete.

(of disposition) unwilingly to fall behind, ambitious, emulous

You often have good questions! The difference between "仍然“ and "还” is a bit difficult to explain.If I have any idea, let me try to answer it !