BTW <voice of Speak N Spell> The correct spelling is A-C-Q-U-A-I-N-T-A-N-C-E
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On Password Plus in the early part of the run, they were more lenient. For example "Firewoman" was acceptable for "Fireman". Also, forms of the password were considered correct, the player did not have to give the correct form. I believe the "no opposites" rule was implemented because too many celebs and players were relying on opposites to convey passwords. At the beginning of the run, each side got 3 clues each, later it was 2 clues each. Also, the team that DIDN'T guess the password got the first clue of the next password. (As was the case for the previous Passwords) Fortunately they realized that gave that team an unfair advantage guessing the puzzle and changed the rule.
Super Password, for the first show only, had a rule that if a player couldn't come up with a clue for a password in time, the other side got two clues. This was quickly scrapped because it was just too confusing. Super Password also nixed the "play or pass" option.
On all versions, the password had to be an actual word, or a well recognized slang word. (For some reason, Betty White's clue for kiss, "mmmmwah", was allowed, even though it's not a word) Pantomime is never allowed, but you can use your face to some extent. You can smile to convey "happy", but you can't move your eyebrows to convey "eyebrows" (as Bowzer did on one show) or wink to convey "wink".