mào​pái

counterfeit

冒牌 mào​pái
counterfeit adjective
a fake or imitation version of a branded product

There are many counterfeit luxury goods on the market.

impostor adjective
a person who fraudulently claims to be someone else or a qualified professional, such as a quack doctor

The police quickly saw through the lies of that fake expert.

Frequency

Movie subtitles
1.73 per million appears in 1% of films
Written text
1.16 per million

Sources

Definitions
CC-CEDICT