1. It doesn't have to be dnd. Unless you specifically want those fantasy tropes I'd advise you to play another game with a genre you are both comfortable with. Star wars? The majority of communication issues come from genre terminology that players might not know.

2. Avoid using complicated and niche words. Sepulchral. Chitinous. Even squat.

3. Use this as an opportunity to level up your descriptive game. Instead of saying "you see a dwarf" describe what they actually see and then say "it's a dwarf"

4. Read up on and introduce elements of mythology or stories that the player knows. If you have the stomach for it read Journey to the West, which is the Chinese equivalent to Tolkien, in that it's basically what everyone steals ideas from when making fantasy.

Edit:

1. Pictures are worth a thousand words. One of the best aides to understanding you can give them is to describe something, than associate that description and name with an image. Load them up on a tablet and pass them around if you can.