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: Precipitation falls on the windward side of the mountain range. 
Sentence2: Sheep tend to favour the windward side of a paddock.

A: windward
****
Q: Sentence1: smell is used for finding food by some animals. 
Sentence2: Food includes small rodents and birds.

A: food
****
Q: Sentence1: Coffee is an excellent source of caffeine. 
Sentence2: coffee contains a psychoactive drug.

A:
Coffee
****