"The fall is hot."
Just answered you on the other thread.
The hot fall: الخريف الحار
The fall is hot: الخريف حار
Notice the change in the definition article (AL) with the adjective hot حار. Adding and removing (AL) changes the status of the word from being an attributive adjective (the hot fall) when added, to a predicative adjective when removed (the fall is hot).