Both cactuses and cacti are accepted plurals of cactus. Here is why English allows both forms, with simple examples.

This expression began with care, meaning worry, not curiosity. Here is how the phrase changed and how people use it now.

The s in island was added later because of a mistaken link to Latin insula. The older English form was iland, from Old English roots.

Kayak entered English from Inuit and Yupik languages, where related words referred to a hunter’s boat used in Arctic communities.