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: the ovaries are used in reproduction. 
Sentence2: Egg released by the ovary.
Example Output: ovaries

Example Input: Sentence1: bacteria cause food to spoil. 
Sentence2: Food poisoning occurs when spoiled food is eaten.
Example Output: spoil

Example Input: Sentence1: Genes that are located on the same chromosome are called linked genes. 
Sentence2: Linked genes are inherited together.
Example Output:
genes