Solutions Fish (low voice) has 8 entries with similar clues

• 5-letter words
• croonSpeak in a low soft voice
• bassoLow male voice
• 6-letter words
• mutterTalk indistinctly in a low voice
• 8-letter words
• baritoneAdult male singing voice from lowest pitch to highest
• 9-letter words
• contraltoThe lowest female singing voice
• 13-letter words
• mezzo-sopranoFemale singing voice from lowest pitch to highest
• 14-letter words
• basso-profundoAdult male singing voice from lowest pitch to highest
• 15-letter words
• or-countertenorAdult male singing voice from lowest pitch to highest