• 声こえ — voice
• 音声おんせい — audio / voice
• 大声おおごえ — loud voice
• 小声こごえ — low voice
• 声優せいゆう — voice actor
• 歓声かんせい — cheer / shout of joy

More examples ▼

• 鳴なき声ごえ — cry (of an animal)
• 声明せいめい — statement / declaration
• 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
• 歌声うたごえ — singing 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).