How do i check every element of an array for a condition?

I want to check which elements of an array contain the word "circuit", yet i have no idea where to even start...
What do you need that information for?

The "contain" can be intepreted more than one way:
1. Each element is a word. List elements, whose word == "circuit"
2. Each element is a word. "circuitry" contains "circuit"
3. Each element is a book. List elements, that contain "circuit"
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