About the word "such" (100 marks given)

1)Definition:
adj.
1. of that, or the like, kind
這樣的；類似的；同樣的
2. having the particular quality or character named
有某種性質的
3. the same as previously mentioned or referred to
諸如此類的
4. indicating a certain person or thing
指某人或某物的
5. the same
如此的（as）
6. so remarkable, so great
非常的；了不起的
adv.
1. to such a degree
至…程度
2. very
十分地
pron.
1. such a person or thing
（用作單數或複數）如此之人；如此之事物
2. the person or thing indicated
此人；此事

2) Word classes? I think you mean which "part of speech" does it belong to.
Adjative, adverb, pronoun

3) Adjative:
1. 這樣的,此類的
She has bought paper, pens, and other such stationery.
她買了紙,筆以及諸如此類的文具。
Such accidents should not happen again.
不可以再發生這種事故了。
2. (與that連用)如此的...(以致)
He is such a good teacher that all his pupils like him.
他是位極好的老師,所有的學生都喜歡他。
3. (表示驚歎或加強語氣)這樣的,這等的
It was such an exciting game.
那場比賽真是精彩刺激。
Adverb:
1. to such a degree
至…程度
I have studies to such a degree, what do you want from me?

Pronoun:
1. 這樣的人(或事物);上述的人(或事物)[M]
Such were her words.
她就是這麼說的。
Such is their decision.
他們的決定就是這樣。
There is no such thing.
沒有這樣的東西。

4. there is no such words! If you mean the confusion on spelling, I guess there is one I can think of.
1. suck
You suck! (你好廢/ 你爛透了!)
This job sucks, I'm quitting. (這工作爛透了, 我不想幹了。)

The spelling of the word "Adjative " should be "Adjective ".

Her sound is to be pleasant to listen to,sound such like a bird
He doesn't want to get a job after school,such as a lazy man