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: Nitrogen is found in proteins, nucleic acids, and chlorophyll. 
Sentence2: Nitrogen, as a gas, is colorless, odorless, and a generally inert element.
Nitrogen

Sentence1: Fish are the first known true chordates. 
Sentence2: Fish are the first known animal with a backbone.
Fish

Sentence1: Food is easier to chew because it is moistened by saliva from the salivary glands. 
Sentence2: Food enters the mouth and is partially broken down by chewing and by enzymes in saliva.

salivary