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.

Q: Sentence1: Arthropods Arthropods have jointed segmented exoskeletons. 
Sentence2: Insects have jointed segmented exoskeletons.

A: exoskeletons
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Q: Sentence1: creating paper requires cutting down trees. 
Sentence2: Trees begin as epiphytes on host trees.

A: trees
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Q: Sentence1: Pushes and pulls can change the movement of an object. 
Sentence2: Pushes and pulls can change the movement of something or have it remain stationary.

A:
Pushes
****