LINQ–search for items in a list that are present in another list

Suppose you have a list of strings – a nursery rhyme may be a good example.  And you need to find ALL the words that match from another list of words.

Using LINQ to search a list for items in another list (should return a collection of all the matching words – “The,”, “Mouse”,”Up”

        var rhyme = "The mouse ran up the clock";
        private string[] wordsToSearchFor =

        public IQueryable<string> FindWordsInRhyme()

            var wordsFoundInRhyme = rhyme.Where(a => wordsToSearchFor.Count(i => a.ToString().Contains(i)) == 0);
            return wordsFoundInRhyme;

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