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: keeping food cold is used for keeping food fresh. 
Sentence2: Keeping food cold is used to keep food simple and natural as possible.
cold

Sentence1: moss causes chemical weathering. 
Sentence2: Sphagnum moss mixed with peat moss.
moss

Sentence1: Most soil nutrients are cations. 
Sentence2: decomposition increases the amount of cations in the soil.

cations