Answer:
A root word is the primary form of a word while a base word is a word that can stand on its own.
Step-by-step explanation:
What's a Base Word?
A base word is a word that can stand on its own. It conveys full meaning on its own and doesn’t need a prefix or suffix to carry its connotation.
Happy is a base word and not a root word because it means what it is. Add the prefix un- and it completely changes its meaning into an entirely different word, which is unhappy.
What Is a Root Word?
Root words in the English language hail from Latin or Greek words. The root word, or word root, from these ancient languages, cannot stand alone. It does not have a prefix at the front of the word or a suffix attached to the end. It is the main lexical unit of a word family and can’t be broken down into words that can stand on their own with meaning.