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.

[Q]: Sentence1: an animal requires nutrients to grow and heal. 
Sentence2: Microbes can help an animal to grow and heal.
[A]: grow


[Q]: Sentence1: Flowers produce seeds for reproduction. 
Sentence2: flowers require dispersal for reproduction.
[A]: Flowers


[Q]: Sentence1: coal is used to produce electricity by burning in coal-fire power stations. 
Sentence2: Swamp vegetation is used to produce electricity by burning in power stations.
[A]:
burning