Ex. bicycle. Cycle is the root and the prefix is bi meaning two or a two wheeled cycle. The word meaningless has a suffix of less, the root word is meaning. Not all words will have a root like this or a prefix or a suffix. So pennant would be the root word, not pen, because prefixes and suffixes modify the meaning of the root word. Don't spend too much time on one word, I -am sure you have a whole list for homework. I hope I am correct, this was off the top of my head from grammar school English.