Pinyin is a synonym of hohhot.

As proper nouns the difference between pinyin and hohhot

is that pinyin is a system of romanization (phonetic notation and transliteration to roman script) for mandarin chinese based on the mandarin dialect of the beijing area used in the people’s republic of china or pinyin can be a niger-congo language of cameroon while hohhot is a city in north-central china, capital of inner mongolia (nei mongol).