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: Enveloped viruses make their own membranes. 
Sentence2: Some viruses make their own membranes.

A: make
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Q: Sentence1: Plants use unsaturated fatty acids to store energy. 
Sentence2: Plants and fish contain fatty acids.

A: Plants
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Q: Sentence1: heavy rains cause flooding. 
Sentence2: Heavy rains damage homes.

A:
heavy
****