Here are some other possibilities, depending on the context:
* Fisura: This is a more formal word for "crevice," often used in technical contexts.
* Hendidura: This word is also used for a narrow opening or split, and it's more common in literature or poetry.
* Resquicio: This word implies a small, narrow opening, like a crack in a wall or a space between things.
It's always best to consider the context and choose the word that best fits the situation.