counterfeit /ˈkaʊntəfɪt/ (v): 

# (formal) ​counterfeit something l to make an exact copy of something in order to trick people into thinking that it is the real thing.

COMPARE forge;

counterfeiter /ˈkaʊntəfɪtə(r)/ (n):

# ​a person who counterfeits money or goods.

COMPARE forger;

counterfeiting /ˈkaʊntəfɪtɪŋ/ (n):

# [uncountable] (formal) ​the crime of making an exact copy of something in order to trick people into thinking that it is the real thing.

COMPARE forgery;