What buttons are built-in with version 4?

I want to customize my toolbar at the button level, but I cannot find any current documentation on which buttons are available. For example, 'TextColor' and 'BGColor' appear in older docs, but don't seem to work. Same for 'SpellChecker'. What's available in Ver. 4?

 config.toolbar_Mytoolbar = [
    ['Source','TextCcolor','BGColor'],
    ['Cut','Copy','Paste','PasteText','PasteFromWord','-','SpellCheck'],
    ['Bold','Italic','-','NumberedList','BulletedList']
 ];