Thunderhead and Woolpack

Thunderhead noun - A rounded projecting mass of a cumulus cloud with shining edges; often appears before a thunderstorm.

Woolpack and thunderhead are semantically related in mass of water particles in air topic. In some cases you can use "Woolpack" instead a noun "Thunderhead".

Thunderhead and woolpack are semantically related in mass of water particles in air topic. You can use "Thunderhead" instead a noun "Woolpack".