noisy是形容词来的
noise才是名词,有时可数有时不可数;
2.不可数. 表示喧闹,闹声.
Don't make too much noise. 不可数;
1.可数,表示声音,噪声.
What's up? There's such a loud noise in the corridor.
出什么事啦?走廊里喧闹声那么大.