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: Cancer is a disease in which cells divide out of control. 
Sentence2: Cancer is a disease in which cells grow and divide rapidly.
answer:
Cancer


question:
Sentence1: An accounting period is simply a period of time. 
Sentence2: seconds are used to measure a period.
answer:
period


question:
Sentence1: Platypus females lay their eggs in a burrow. 
Sentence2: platypus females lay their eggs in soft soil.
answer:

Platypus