The difference between Waterproof and Watertight
When used as adjectives, waterproof means unaffected by water, whereas watertight means so tightly made that water cannot enter or escape.
Waterproof is also noun with the meaning: a substance or preparation for rendering cloth, leather, etc., impervious to water.
Waterproof is also verb with the meaning: to make waterproof or water-resistant.
check bellow for the other definitions of Waterproof and Watertight
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Waterproof as an adjective:
Unaffected by water.
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Waterproof as an adjective:
Made of or covered with material that doesn't allow water in.
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Waterproof as an adjective (figurative):
Incapable of failing; unassailable.
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Waterproof as a verb:
To make waterproof or water-resistant.
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Waterproof as a noun:
A substance or preparation for rendering cloth, leather, etc., impervious to water.
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Waterproof as a noun:
Cloth made waterproof, or any article made of such cloth, or of other waterproof material, as rubber; especially, an outer garment made of such material.
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Watertight as an adjective:
So tightly made that water cannot enter or escape.
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Watertight as an adjective (figurative):
So devised or planned as to be impossible to defeat, evade or nullify.
Examples:
"a watertight contract; a watertight regulation"