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: Humans have collected and grown mushrooms for food for thousands of years.
Sentence2: Yeast and mushrooms are types of fungus.
[A]: mushrooms

[Q]: Sentence1: if an object is made of a material then that object has the properties of that material.
Sentence2: If an object is made of a drug, then that object has the properties of that drug.
[A]: made

[Q]: Sentence1: Dilation occurs when cell walls relax.
Sentence2: Blood flow is improved by vitamin E and it causes blood vessels to dilate or expand.
[A]:
Dilation