Susurrar vs. cuchichear

The Spanish verbs 'susurrar' and 'cuchichear' both translate to 'to whisper' in English. However, they are utilized in diverse contexts and carry subtly different nuances of meaning.

Susurrar

'Susurrar' refers to speaking very softly, often in close proximity to someone's ear. This word expresses a softer and more gentle form of whispering, such as might occur between lovers or when trying not to wake a sleeping child.
Ella le susurra al oído un secreto.
(She whispers a secret in his ear.)
Tengo que susurrar porque el bebé está durmiendo.
(I have to whisper because the baby is sleeping.)

Cuchichear

'Cuchichear' also means 'to whisper', but it's often used to denote whispering that is done for the purpose of secrecy, or to share information without others hearing. It often implies gossip or scheming.
Las chicas cuchicheaban en el rincón de la sala.
(The girls were whispering in the corner of the room.)
Los conspiradores cuchicheaban entre .
(The conspirators whispered among themselves.)

Summary

'Susurrar' and 'cuchichear', while both translate to 'to whisper', are used in slightly different contexts in Spanish. 'Susurrar' conveys a sense of gentle or intimate whispering, while ‘cuchichear’ is more associated with secretive conversation or gossip.