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.

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


[Q]: Sentence1: a camera is used for recording images. 
Sentence2: a camera is used for recording binary.
[A]: camera


[Q]: Sentence1: Viruses contain DNA but not much else. 
Sentence2: Where most viruses are DNA, HIV is an RNA virus.
[A]:
DNA