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: All chemical reactions require activation energy to get started. 
Sentence2: Catalysts lower the activation energy.
answer:
activation


question:
Sentence1: Muscles can only contract. 
Sentence2: Contraction is a type of movement.
answer:
contract


question:
Sentence1: Sea anemones are close relatives of corals . 
Sentence2: close relatives of coral use poisonous darts for defense.
answer:

close