Fake 假的；冒充的；伪造的
Experts revealed that the painting was a fake.
专家揭露了这幅画是假的。

Knock off 假货
Is that the real thing or a knock-off?
这是真品还是假的？

Counterfeit 假货，冒牌
All the jewerely she sold was counterfeit.
她卖的珠宝都是假货。

Bogus 假的；伪造的
She produced some bogus documents to support her claim.
她伪造了假文书来证明自己。

Phony 假的；冒充的；欺骗的
She's such a phony. You can't believe aword she says.
她很假的。你不能相信她说的任何一个字。

Pseudo- 假的；伪的；冒牌的
You shouldn't buy their products. It's all based on psuedo-science.
你不应该买他们的产品。（他们的产品）都是伪科学。

Copycat （尤为儿童用语，指无主见的）模仿者，抄袭者，好跟人学的人
Wig 假发
Dentures 假牙