What is the difference between a root word and a combining form?

list 2 examples of combining form

The difference is the combining vowel

Explanation:

The Combining form needs the vowel to form, that is:

root word +  combining vowel = combining form

Root word:

A root is a word that does not have a prefix in front of the word or a suffix at the end of the word. The root word is the main lexical unit of a word and a family of words, which carries the most significant aspects of semantic content and cannot be reduced to smaller components

Combining form:

Training process of  words from two or more roots or simple words.

When the word includes a cultured base and a patrimonial base, we will consider derived word. For example, hypermarket, bi-monthly