1. lookingRoot word: lookPrefix: noneSuffix: -ing2. playfulRoot word: playPrefix: noneSuffix: -ful3. brightestRoot word: brightPrefix: noneSuffix: -est4. plainlessRoot word: plainPrefix: noneSuffix: -less5. unplanedRoot word: planPrefix: un-Suffix: -edWhen we say Root word it's the basic word without any added parts. Prefix is a part of a word that is added at the beginning of a root word, while a Suffix is a part of a word that is added at the end of a root word.