cake (large), tart
The article is part of the word: la tarta. That way you learn the gender with it.
On the card “cake (large)”, ripiti also accepts el pastel. Not the other way round: for el pastel, la tarta is not accepted.
Remember la tarta for good. ripiti brings the word back just before you forget it, with these sentences. Free, no account needed, works offline.
practise la tarta in ripiti