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: Temperature Scales Temperature is the energy of vibration. 
Sentence2: a thermometer is used to measure energy of vibration.
answer:
energy


question:
Sentence1: Interstellar space contains a plasma. 
Sentence2: interstellar space contains electrons, atoms, and stars.
answer:
Interstellar


question:
Sentence1: Mutualism is a symbiotic relationship in which both species benefit. 
Sentence2: Lichens are a symbiotic association between a fungus and an alga.
answer:

symbiotic