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: Combustion generates toxic fumes. 
Sentence2: High temperatures can cause toxic fumes.
answer:
fumes


question:
Sentence1: if an object is black then that object absorbs all visible light. 
Sentence2: Something is black if it absorbs visible light and doesn't reflect.
answer:
light


question:
Sentence1: Plants respond to daily and seasonal cycles and to disease. 
Sentence2: Plant diseases cause by bacteria.
answer:

disease