Do they? Flower, flour, ants, hence, its, hits, tits, lead, led, lead, let, lit. It's especially hard in a language where spelling doesn't always suggest the wright pronunciation: read and read, lead and lead.
Sometimes, the combination of words can also be confusing, because you can't tell where the words end. before.head, bee.forehead.
Another issue I remember was that the plural version pointed to a different place altogether.
I used w3w (the triwords are great drawing prompts), and I had to repeat them multiple times to my friend drawing across the table. I didn't remember them after drawing them for a few minutes.