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: Like proteins, DNA and RNA are polymers of various small chemically related molecules. 
Sentence2: polymers of various small chemically related molecules can squeeze through pores in the nuclear membrane.

molecules