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.

Sentence1: Humans have collected and grown mushrooms for food for thousands of years. 
Sentence2: humans have collected and grown porcinis for thousands of years.
Humans

Sentence1: Crops are plants that are grown for food or other uses. 
Sentence2: insects destroy plants.
plants

Sentence1: Moles spend most of their time underground. 
Sentence2: Moles are especially adept at hiding from predators.

Moles