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: soil is formed by weathering. 
Sentence2: Something described as loamy is formed by weathering.
formed

Sentence1: Graphite and diamond are polymorphs of carbon. 
Sentence2: carbon polymorphs are used for making pencil lead.
carbon

Sentence1: zinc has a positive impact on the healing of wounds. 
Sentence2: A healing mineral has a positive impact on wounds.

impact