Playing an phony (e.g., deviaters*). Bluffing might be done purposefully in order to test your opponent's word knowledge or unintentionally because of your belief that a phony word is acceptable. Bluffing is perfectly acceptable in organized Scrabble. See Phony.
Tricking other players into thinking that you have a better hand than you do
The act of deliberately playing a phoney word. This is completely ethical and is a weapon used by many experts, even against other experts.
Bluffing is when you pretend you have a good hand in poker, and you raise the other player into thinking that you have a better hand, this way you can steal the pot, or at times take the player out.
deliberately misrepresenting the strength of a hand to induce a mistake from an opponent. Examples include placing a large bet with poor cards in the hope an opponent folds, or betting low amounts with a strong hand to get another player to raise
betting on a weak hand in order to convince others the hand is strong.