"Barca" is a boat, not a ship. The image prompts in this sections were misleading, so I just deactivated that question. If you do an image search for "barca mare" (to weed out pictures of Barcelona's soccer team), you can get a better idea of what falls into this category.
Besides, not accepting "mama," as has already been noted, it is very annoying that when DL asks us to translate "barca" elsewhere, it suggests both ship and boat, but here is will only take boat. A little consistency would be very helpful, please.