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: a light bulb is used for seeing in the dark. 
Sentence2: light is required for seeing.
seeing

Sentence1: Long-distance telephone calls can also use radio waves or microwaves. 
Sentence2: Telephones use radio waves for communication.

radio