A cloud, the mass of vapour that brings shade and rain to the parched earth.
Literally: cloud
The abr is the cloud — bearer of rain and so of mercy and grace, the giver that withholds or pours; classically the 'abr-e-karam,' the cloud of bounty, and the 'abr-e-bahar,' the spring cloud that revives the garden. It can also veil the sun or weep across the sky. Iqbal uses the rain-cloud as an image of generous outpouring and of the grace that makes the dry self bloom, the bounty that descends so the seed may rise.
Baadal
A cloud, the gathering of vapour in the sky that promises rain.
Baaraan
Rain, the water that falls from the clouds to quicken the earth.
Barq
Lightning, the sudden flash that splits the storm-cloud.
Raad
Thunder, the deep roll of sound that follows the lightning of the storm.