Black Hood

 Black hood with large mantle

I would like to say more, but see previous posts about hoods.

Black and White Hood

 Another hood, this one is made of thin cotton fabric and sewn in separate panels of black and white fabric.

The mantle that covers shoulders has the colour reversed, which gives a pleasant look.

The fabric really makes this more a fancy dress costume item than a historical reproduction or useful hood.

White Hood

This white hood made from some cotton-based fabric.

 Hoods are thought to have been imported from Normandy during the 12th Century. 

Medieval Hoods were mostly worn for protection against wind, rain, and cold weather, but in some cases, they were a protection from bladed weapons.

This white hood is not typical of a medieval hood because it ties at the front.

The ties at the front serve no obvious purpose, you don't need to loosen to get the hood on your head, you can't pull tighter to close against the wind, so the ties are purely a decorative item.

Monks Cowl

A Monks Cowl, in this case, the cowl is separate from the robe, they can be one garment.

 Cowl or Hood.  What's the difference between a Hood and a Cowl well not much really

There seem to be many definitions and the garment changes they refer to also change over time, these are my definitions.

A cowl is a hood that is generally worn by monks, it can be attached to a garment such as a robe and can be pulled forward to cover the face.

A hood is a soft covering for the whole head with a hole for the face and neck and is usually part of another garment such as a coat or cloak, but can also be a separate  garment all on its own

So if you read the description the only real difference is perhaps a cowl is worn by monks, but otherwise, it's the same garment.