Hello TC,
Thank you for posting in Microsoft Community. We are happy to help you.
Yes, there is a specific version of Office that you can purchase for your MacBook Air. You can purchase Office for Mac, which includes Word, Excel, PowerPoint and Outlook.
You can purchase it as a one-time purchase such as Office Home & Business 2021 or as a subscription-based service, such as Microsoft 365 Family or Microsoft 365 Personal, for your reference: Compare Microsoft 365 plans.
Note: To provide you with the best experience, Office supports the three most recent major versions of Apple's macOS. So please ensure your macOS is macOS Monterey or higher version.
By the way, if you already have a Microsoft 365 Family/Personal subscription and installed Office on PC from the subscription, you can now install Office apps on your MacBook Air by visiting https://www.office.com and log in your account, then click "Install Office" from upper-right corner.
I hope it helps.
Let me know if you have any concerns, I'll be glad to help you further.
Have a nice day!
Sincerely,
Tina | Microsoft Community Moderator