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: a tape measure is used to measure length. 
Sentence2: Length The Base unit for length in the metric system is the meter .
[A]: length


[Q]: Sentence1: Autumn brings the changing of the seasons. 
Sentence2: Earth 's tilt on its rotating axis causes autumn.
[A]: Autumn


[Q]: Sentence1: safety goggles are used for protecting the eyes during experiments. 
Sentence2: glasses with sideshields are recommended for protecting the eyes during experiments.
[A]:
during