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.

[EX Q]: Sentence1: a camera is used for recording images. 
Sentence2: a camera is used for recording binary.
[EX A]: camera

[EX Q]: Sentence1: Osteoporosis is a disease in which osteoclasts are more active than osteoblasts. 
Sentence2: a thinning and weakening of bone is a disease in which osteoclasts are more active than osteoblasts.
[EX A]: active

[EX Q]: Sentence1: if an object reflects light toward the eye then that object can be seen. 
Sentence2: The light from the moon we see with our eyes comes from the sun.
[EX A]:
light