Are azaleas a type of rhododendron?

[Dahlia]

My plant app kept saying "rhododendron" for these two flowers. I think the bushy one is an azalea.

 

[SPedigrees]

My plant app kept saying "rhododendron" for these two flowers. I think the bushy one is an azalea.

It seems they are.

This from https://www.birdsandblooms.com/gardening/flower-gardening/rhododendron-vs-azalea/ :

Are Rhododendrons and Azaleas the Same?​

The two plants are very closely related. In fact, azaleas are actually part the rhododendron genus. This means all azaleas are technically rhododendrons, but not all rhododendrons are azaleas.