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: Fully cooking oysters kills the bacteria. 
Sentence2: Fully cooking oysters can prevent illness.

A: Fully
****
Q: Sentence1: a tape measure is used to measure length. 
Sentence2: Length The Base unit for length in the metric system is the meter .

A: length
****
Q: Sentence1: Most hormones are regulated by feedback mechanisms. 
Sentence2: Homeostasis involves negative feedback mechanisms.

A:
feedback
****