Definitions of lament:

• noun:   a cry of sorrow and grief

  Example: "Their pitiful laments could be heard throughout the ward"

• noun:   a mournful poem; a lament for the dead
• noun:   a song or hymn of mourning composed or performed as a memorial to a dead person
• verb:   express grief verbally

  Example: "We lamented the death of the child"

• verb:   regret strongly

  Example: "We lamented the loss of benefits"