My husband, Mr Libro, likes these words, he suggested last week’s too. I have to say I agree with him, too, even if any confusion between them in likely to be more of a typo than an error in meaning.

To undulate means to move smoothly in a wave-like manner.

An ungulate is a hoofed mammal, such as a cow. I thought it only meant hoofed animals that chew the cud, so you really do learn a new thing every day!

You can find more troublesome pairs here, and here’s the index to them all!