Yes, wader is in the scrabble dictionary.

What wader means?

1 : one that wades. 2 : shorebird also : wading bird. 3 waders plural : high waterproof boots or a one-piece waterproof garment usually consisting of pants with attached boots that are used for wading (as when fishing)

Does Spanish scrabble exist?

Spanish Scrabble plays just like the classic Scrabble, but different letter values on the tiles correspond with Spanish language usage. It's a great way to practice Spanish as a second language! So challenge your friends to a game in Espanol!