Generate an overlapping word between the given two sentences. When you find the overlapping words, they don't have to match exactly, e.g., "survival" and "survive" are valid overlapping words. Little words like "the" or "of" don't count! You must generate significant words which are not the stop words.
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Question: Sentence1: Veins generally carry deoxygenated blood. 
Sentence2: Blood carries blood cells.

Answer: blood


Question: Sentence1: a light bulb is used for seeing in the dark. 
Sentence2: Conventional light bulbs generate light by heating a filament.

Answer: bulb


Question: Sentence1: ice wedging is when ice causes rocks to crack by expanding in openings. 
Sentence2: Water in the cracks of rocks freeze and expand.

Answer:
crack