There isn't a definitive list but you might also check /doc/5.reference/help-intro.pd (/doc/5.reference/0.INTRO.txt in older versions) in the documentation that comes with pd. Open it by right-clicking on the background of a patch and select "Help".

While you are there, get the directory listing of the /doc/5.reference/ folder and look for objects not already mentioned in help-intro.pd