• 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

声 refers to a human voice — the sound a person makes when speaking or calling out. It can also extend to “public voice” or “support,” as in 声援 (cheering).