The difference between Counterfeit and Spurious

When used as adjectives, counterfeit means false, especially of money, whereas spurious means false, not authentic, not genuine.

Counterfeit is also noun with the meaning: a non-genuine article.

Counterfeit is also verb with the meaning: to falsely produce what appears to be official or valid.

check bellow for the other definitions of Counterfeit and Spurious

Counterfeit as an adjective:

False, especially of money; intended to deceive or carry appearance of being genuine.

Examples:

"This counterfeit watch looks like the real thing, but it broke a week after I bought it."
Counterfeit as an adjective:

Inauthentic.

Examples:

"counterfeit sympathy"
Counterfeit as an adjective:

Assuming the appearance of something; deceitful; hypocritical.

Counterfeit as a noun:

A non-genuine article; a fake.
Counterfeit as a noun:

One who counterfeits; a counterfeiter.
Counterfeit as a noun (obsolete):

That which resembles another thing; a likeness; a portrait; a counterpart.
Counterfeit as a noun (obsolete):

An impostor; a cheat.

Counterfeit as a verb (transitive):

To falsely produce what appears to be official or valid; to produce a forged copy of.

Examples:

"to counterfeit the signature of another, coins, notes, etc."
Counterfeit as a verb (transitive, obsolete):

To produce a faithful copy of.
Counterfeit as a verb (transitive, obsolete):

To feign; to mimic.

Examples:

"to counterfeit the voice of another person"
Counterfeit as a verb (transitive, poker, usually "be counterfeited"):

Of a turn or river card, to invalidate a player's hand by making a better hand on the board.