List<string> wordBank = new List<string> {
"iphone", "airpods", "laptop","computer","calculator","ram","graphics", "cable","internet","world wide web"
};
//select random word
Random wordRand = new Random();
int index = wordRand.Next(wordBank.Count);
string wordSelect = wordBank[index];
wordBank.RemoveAt(index);
//or
wordBank.Remove(wordSelect);
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solved Remove element of Array (c#) [duplicate]