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.
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Question: Sentence1: natural magnetism is used for pointing north by a compass. 
Sentence2: For the ordinary compass, align to the North direction.

Answer: north


Question: Sentence1: plant requires seed dispersal for reproduction. 
Sentence2: plants are pollinated by birds.

Answer: plant


Question: Sentence1: Marine biomes are found in the salt water of the ocean. 
Sentence2: coral reefs are found in salt water of ocean.

Answer:
ocean