A back vowel is a sound where the back of the tongue approaches the palate.

Back vowels are vowels that are pronounced using the back of the tongue.

A front vowel is a vowel that is articulated with the front part of the tongue.

The central vowels in Japanese are 'a', 'e', 'o'.

A central vowel is a vowel that is pronounced in the central part of the tongue.

Front vowels are pronounced using the front part of the tongue.

His height is taller than mine.

His back was very broad, giving a sense of strength.

He is an expert in musicology.

This room is covered with soundproofing material, so the sound doesn't leak outside.