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: a circle graph can be used to display percents. 
Sentence2: pie charts are circle graphs.
answer:
circle


question:
Sentence1: Most pituitary hormones control other endocrine glands. 
Sentence2: Hormones tell the ovaries to produce eggs.
answer:
hormones


question:
Sentence1: Incandescent lights heat a metal filament that radiates light inside a glass bulb. 
Sentence2: Incandescent lights heating a metal filament are used for seeing in the dark.
answer:

Incandescent