Select the most appropriate one-word substitution for the given group of words

A word or part of a word which contains one sound of a vowel.

Syllable

The most appropriate one-word substitution for the given group of words is syllable.

• Egalitarian means believing in or supporting equal rights for all people.
• Agrarian means relating to or concerned with agriculture.
• Simile is a figure of speech that compares two things using the words "like" or "as".
• Syllable is a unit of pronunciation consisting of a single vowel sound and any surrounding consonants.