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.

Q: Sentence1: Centrioles come in pairs. 
Sentence2: Something that comes in pairs are organelles involved in cell division.

A: come
****
Q: Sentence1: Heat and temperature are the same. 
Sentence2: a thermometer is used to measure heat.

A: Heat
****
Q: Sentence1: Coral reefs provide food and shelter to many ocean organisms. 
Sentence2: clownfish seek shelter in coral.

A:
Coral
****