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: With a spatula, fold in flour mixture. 
Sentence2: a sifter is used for separating flour.

Answer: flour


Question: Sentence1: if humans disturb animals in a location then those animals will move to a different location. 
Sentence2: The human being is self-aware.

Answer: humans


Question: Sentence1: Some trees are maples. 
Sentence2: planting maples has a positive impact on an ecosystem.

Answer:
maples