private boolean validWord(String word)
	{
		NumberConverter nc = new NumberConverter();
		if(nc.checkIfNegative(word) || nc.checkIfZero(word) || nc.checkIfOne(word) || nc.checkIfTen(word) || nc.checkIfTeen(word) || word.equals("million") || word.equals("thousand") || word.equals("hundred"))
		{
			return true;
		}
		else
		{
			System.err.println("'" + word + "' is not a valid word");
			System.exit(7);
			return false;
		}
	}