"waterproof" in the noun sense
1. waterproof
any fabric impervious to water
2. raincoat, waterproof
a water-resistant coat
"waterproof" in the verb sense
1. waterproof
make watertight
"Waterproof the coat"
"waterproof" in the adjective sense
1. rainproof, waterproof, waterproofed
not permitting the passage of water
Source: WordNet® (An amazing lexical database of English)
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