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: bacteria cause food to spoil. 
Sentence2: Food poisoning occurs when spoiled food is eaten.
answer:
spoil


question:
Sentence1: a plant requires sunlight to grow. 
Sentence2: Grass needs air and sunlight.
answer:
sunlight


question:
Sentence1: telephones are used for communication by two people by transmitting sound. 
Sentence2: telephones are used for communication by two people by transmitting signals.
answer:

communication