Plant milks have been called milks for centuries at this point. It's probably okay.
ETA: The Mahābhārata, a book dating back to 400BCE, refers to making rice milk. So...
https://books.google.com/books?id=ivQ6CwAAQBAJ&pg=PT14&lpg=P...
That excerpt is talking about deceiving someone with dilute pounded rice served as milk.
You do know why animals (including humans) produce milk, don't you?