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.

Example Input: Sentence1: Sand and mud are examples of sediments. 
Sentence2: layers of sand over the remains of organisms over time can create fossils.
Example Output: Sand

Example Input: Sentence1: Without light there is no sense of vision. 
Sentence2: Glass causes a sense of vision.
Example Output: sense

Example Input: Sentence1: a plant requires nutrients to grow. 
Sentence2: A rose requires nutrients to grow.
Example Output:
grow