Can an Action be a Bonus Action?

@DastionCan an Action be a Bonus Action? i.e Can a Bard use a BA to grant Bardic Inspiration and an action to cast Healing Word? Actions and bonus actions aren't interchangeable, so that bard could use Bardic Inspiration or healing word, not both on a turn. — Jeremy Crawford (@JeremyECrawford) August 27, 2014