• 音声おんせい — audio, voice
• 声明せいめい — statement, declaration
• 声優せいゆう — voice actor
• 声楽せいがく — vocal music
• 声援せいえん — cheer, encouragement
• 名声めいせい — fame / reputation
• 発声はっせい — utterance / vocalization
• 肉声にくせい — one's own voice

The character 声 combines parts that represent “ear” and “sound” with a base implying structure or formality. It originally referred to the sound a person makes — a voice. Over time, it expanded to cover vocal sounds and expressions.

彼かれの声こえは とても大おおきいです。
His voice is very loud.

母ははの声こえを聞きいて安心あんしんしました。
I felt relieved after hearing my mother's voice.