instruction:
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.
question:
Sentence1: Flies are insects with two wings. 
Sentence2: Flies are arthropods with two wings.
answer:
Flies


question:
Sentence1: Fractures heal when osteoclasts form new bone. 
Sentence2: Fractures A fracture is a broken or cracked bone.
answer:
Fractures


question:
Sentence1: Cancer cells divide more often than normal cells, and grow out of control. 
Sentence2: Cancer cells, however, grow out of control and develop into a tumor.
answer:

control