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: Consider Input: Sentence1: Some herbivores have more than one stomach. 
Sentence2: Camels are an herbivore.

Output: herbivores


Input: Consider Input: Sentence1: Warm temperatures have helped plant growth and sizing. 
Sentence2: a greenhouse helps  plant growth.

Output: growth


Input: Consider Input: Sentence1: Climate changes across seasons can be explained by the tilt of the Earth's rotation axis. 
Sentence2: The direction the earth is tilted while it orbits the sun is what causes climate to change.


Output: Climate