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: Some trees are maples. 
Sentence2: planting maples has a positive impact on an ecosystem.

Answer: maples


Question: Sentence1: Thunderstorms Thunderstorms give birth to tornadoes. 
Sentence2: Cold fronts can give birth to tornadoes.

Answer:
birth