A compound word starting with "vine" is "vineyard." A vineyard is a plantation where grapevines are cultivated for winemaking or other purposes. It combines "vine," referring to the climbing plant, and "yard," indicating an area of land.
The plural form for the verb vine is vines.
Fallback is a compound word. Falloff and fallout are compound words.
The answer is become.
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One such word is whenever.
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Doable
Snail
roommate
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"Lukewarm."