A root word with an added vowel at the end that makes it easier to pronounce is called a.

A root word combined with a vowel—often “o”—to make it easier to join to another word part is called a combining form. For example, “cardi” plus “o” makes “cardi/o.” A suffix is added to the end of a word, but it has a meaning of its own rather than simply serving as a linking vowel.

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