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: drought is when amount of precipitation decreases. 
Sentence2: Drought decreases the availability and abundance of the natural food supply.
drought

Sentence1: a stopwatch is used to measure time. 
Sentence2: Time can be measured with a clock or watch.
measure

Sentence1: Skin is the body's largest organ. 
Sentence2: Pressure receptors are found mainly in the body's largest organ.

body's