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: All photos are digital images. 
Sentence2: satellites are used to take photos from space.
photos

Sentence1: Plants live just about everywhere on Earth. 
Sentence2: epiphytes live everywhere on earth.
everywhere

Sentence1: mineral graphite is used for making pencil lead. 
Sentence2: Diamond and graphite are made of carbon.

graphite