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.

Ex Input:
Sentence1: camouflage is used for protection by prey against predators. 
Sentence2: blending is used for protection.

Ex Output:
protection


Ex Input:
Sentence1: Bryophytes occupy niches in moist habitats. 
Sentence2: Animals and plants that live in the same place and share resources form a community biome niche .

Ex Output:
niches


Ex Input:
Sentence1: Haploid cells multiply asexually through mitosis. 
Sentence2: Fungi spores can multiply through mitosis.

Ex Output:

mitosis