欢呼 

Pinyin: huān hū 
Meaning：Acclaim; cheer for
Sentence：欢呼声在远处逐渐消失了。The sound of the cheering faded in the distance.

More: 

欢： 

Pinyin: huān
Meaning: Joyous; pleased
Radical: 欠
Stokes: 6
Traditional: 歡
Common words/Phrase:
欢迎 [huān yíng] 【welcome】 
欢乐 [huān lè] 【joyous】
欢庆 [huān qìng] 【festivity】
欢送 [huān sòng] 【see off】
欢笑 [huān xiào] 【laugh happily; belly-laugh】

呼： 

Pinyin: hū
Meaning: To call; to cry; to shout
Radical: 口
Stokes: 8
Traditional: 呼
Common words/Phrase:
呼叫 [hū jiào] 【to shout】
呼吸 [hū xī] 【breathe】
呼吁 [hū yù] 【call on】
呼唤 [hū huàn] 【shout】
呼应 [hū yìng] 【echo】