How to check if any word in my List contains in text

Question

I have a

List words = new List {\"word1\", \"word2\", \"word3\"};

And i want to check using linq if my string

Answer 1

For your first condition

List words = new List { "word1", "word2", "word3" };
string test = "word1";
bool isFound = words.Contains(test);

For your second condition

bool isFound = sentences.Any(x => x.Split(new char[] { ' ' }).Contains(test));

As an unrelated side-note

You are changing the question's scope after getting some answers and that is not a good way to ask questions. :)