Definition: 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.
Input: Sentence1: Sex cells, also called gametes, are the sperm in males and the ova in females. 
Sentence2: A mutation in the gametes of a parent can cause a new trait to appear in the parent 's offspring.

gametes