The 'whisper' group
These nouns refer to tones or types of voice.
in falsetto in whispers in a falsetto in a monotone in an undertone in a whisper in a ... accent in a ... brogue in a ... tone in a ... voice
'Well, gents, how can I help you?' he drawled in an American accent.
His gaze was fixed on Lily; he spoke in a monotone.
Men were talking in whispers in every office.