呻き[umeki] a moan
呻く[umeku] to moan
呻る[unaru] to groan

呻吟[shingin] moaning
呻き声[umekigoe] groan

悪声[akusei] bad voice
雨声[usei] sound of rain
怨声[ensei] complaint
黄色い声[kiiroikoe] shrill voice
音声[onsei] voice

音声圧縮[onseiasshuku] voice compression
音声学[onseigaku] phonetics
仮声[kasei] falsetto
家声[kasei] honour of the family
蚊のささやくような声[kanosasayakuyounakoe] faint voice