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.

Sentence1: Basically, heat is energy. 
Sentence2: Head hair is especially important in preventing energy loss from the body.
energy

Sentence1: friction causes the temperature of an object to increase. 
Sentence2: internal combustion engines get hot.
temperature

Sentence1: Endocrine hormones travel throughout the body in the blood. 
Sentence2: chemical messengers travel throughout the body in the blood.

blood