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: hiding can be used for avoiding predators. 
Sentence2: Camouflage is used for avoiding predators.

Answer: avoiding


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

Answer: maples


Question: Sentence1: Bamboos are vigorous, rugged plants. 
Sentence2: bamboo requires water for survival.

Answer:
Bamboos