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: nectar is used for attracting pollinators by plants. 
Sentence2: butterflies pollinate plants.

Answer: plants


Question: Sentence1: Lymph is a fluid that leaks out of capillaries into spaces between cells. 
Sentence2: Humans are made up of trillions of cells.

Answer: cells


Question: Sentence1: waxy leaves are used for storing water by some plants. 
Sentence2: Plants have many adaptations for conserving water or storing it.

Answer:
storing