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: Muscles can only contract. 
Sentence2: Contraction is a type of movement.
[A]: contract


[Q]: Sentence1: Results can be damaging or disastrous. 
Sentence2: Lack of immunization can be damaging or disastrous.
[A]: damaging


[Q]: Sentence1: When inhaled, the particles lodge in the respiratory system, causing or aggravating health problems. 
Sentence2: a breathing mask keeps harmful particles from being inhaled and causing health problems.
[A]:
causing