There are several terms depending on the nature of the fault.
Error - would be the most popular term and covers a multitude of possibilities including die faults and inconsistencies.
Mule - is a coin that has had the obverse and reverse sides of the coin struck by non-matching dies, for example, a British 5 Pence coin on the obverse and Bailiwick of Jersey 5 Pence coin on the reverse.
Mis-strike - is a coin that has not been struck centrally or properly on the blank.
Upset - is a coin where the obverse and reverse are unintentionally out of alignment (accidental coin rotation).
Brockage - is a coin where one side of the coin has an indented design due to the previously struck coin not having been ejected from the die before the new blank was inserted. This can account for double headers although one side is incuse and back to front.
A besant is another term for a bezant, a coin made of gold or silver, minted at Byzantium.
A Copper is a term used for a penny because pennies were made out of Copper
1985 was only the second year of issue for the Australian One Dollar coin which was issued as a general circulation coin with about 91.4 million minted and a Proof coin with about 75,000 minted. Apart from the usual clips, dings and damaged planchets, there is no record of coins being taken off the market due to a design fault.
Using the term fault in basketball is the same as using the term foul. It means that you touched someone while they had the ball in their hands.
The "konihok" coin does not exist. It seems to be a misspelling or a made-up term. There is no official or recognized currency called konihok in any country.
There is no documentary evidence I can find of a 1938 Australian Crown (Five Shillings) with a "double rim" fault. The 1938 Australian Crown is a sought after collectible coin and only about 101,000 were minted. Many have been melted down for the silver. If the coin and/or the fault is genuine, a double rim fault would certainly increase its value. A reputable coin dealer will be able to verify the coin and give a valuation.
Tennis
No, it shouldn't be.
A pagod is an obsolete term for an idol, or a unit of currency, a coin made of gold or half-gold, issued in India.
The term Proof refers to the method of manufacture and is not a variety. A Proof coin of any denomination is not made for circulation, but to sell to collectors.
San Andreas fault.
The Slang term for a fifty cent coin is a half a buck or 4 bits.