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.

[EX Q]: Sentence1: Trees have woody stems covered with bark. 
Sentence2: Evergreens have woody stems covered with bark.
[EX A]: bark

[EX Q]: Sentence1: All photos are digital images. 
Sentence2: satellites are used to take photos from space.
[EX A]: photos

[EX Q]: Sentence1: the Earth being tilted on its axis causes ones side of the Earth to receive less energy from the Sun than the other side. 
Sentence2: Seasons result from variations in the amount of the sun's energy hitting the surface.
[EX A]:
Sun