Microsoft has decided to rebrand Office Online to simply Office moving forward. They have now chosen to discontinue usage of the “Online” branding with all the Office apps, which means “Word Online” is now “Word,” “Excel on line” is now “Excel,” etc.
Also, it is important to note here that this rebranding only applies to Office apps. There is no change to the branding of the “Online” server products. Specifically Exchange Online, SharePoint Online, Project Online, and Office Online Server.