iPad Air with Microsoft word

No. You download the apps from App Store. You will need to subscribe to Microsoft 365 (formerly Office 365) either directly through Microsoft or through an in-app purchase.

See: https://www.microsoft.com/en-us/microsoft-365/mobile/microsoft-365-mobile-apps-for-ios

and the following from https://apps.apple.com/us/app/microsoft-word/id586447913

To create or edit documents, sign in with a free Microsoft account on devices with a screen size smaller than 10.1 inches.

Unlock the full Microsoft Office experience with a qualifying Microsoft 365 subscription for your phone, tablet, PC, and Mac.