microsoft Word for macbook air?

Yes. Buy Microsoft Office 2008 or newer.

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2008 or 2011, all the others are for Windows.

You can buy Microsoft Office for the Mac, but you should consider a number of better alternatives to Microsoft's bloatware. Some are free or nearly so.

Consider

LibreOffice (donation-supported)

NeoOffice ($30 but older version is free if you can find it)

OpenOffice (donation-supported)

Numbers ($19.99)

Keynote ($19.99)

Pages ($19.99)

I use Numbers and Pages and have been completely Microsoft - free for years. Life is better without Microsoft.