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.

Sentence1: Development means to get better, growth means to get bigger.
Sentence2: Infancy is the period of most rapidly getting bigger after birth.
bigger