The board can only fit so many words for any given letter combination. In cases like these, excess words (and unusual words) will be registered as Extra Words when found.

You don't need to find them to complete the level, but each Extra Word will be converted to a Golden Acorn at the end of the level. Finding Extra Words may also be a Goal requirement, which provides Coin bonuses when completed.

Each word can only be found as an Extra Word once. Hints do not work on Extra Words.