WATERPROOF Scrabble 18 Words With Friends 19 Definition adjective not permitting the passage of water. — synonyms: rainproof, waterproofed verb make watertight. noun any fabric impervious to water. noun a water-resistant coat. — synonyms: raincoat See all 268 words you can make from WATERPROOF → 10-letter words Words starting with W Words ending with F ← Unscramble different letters