There's a lot to untangle here. 1. The Garamond you are using in Word is the Truetype version that Microsoft (and earlier iMac models) installed... usually with just 3 variants, Regular, Italic, and Bold (No Bold Italic). OR installed as part of an Apple iWorks install on your previous computer (which had 4 variants) 2. Adobe Garamond Pro is the updated OTF version of the original Postscript Type 1 that existed for years, sold by (back in the day) by Adobe, with up to 6 variants, but these days most easily available as a Typekit-installed font through your CC Subscription. They are NOT AT ALL the same and quite different in the spacing and design of the fonts, different x-heights, etc. Microsoft supplied the Truetype version along with it's Word installations up to the more recent versions. It apparently no longer comes with Microsoft 365, so new installations on new computers would not get it, as they have moved to a cloud-based font system. This means it's possible your Apple Font Book will not have it now. You should be able to access the Typekit fonts in your current Word installation once activated by your CC Subscription (it does for me, but then I'm using a font manager so I can't speak to how they work with Font Book. I also did a quick search and found there are many people reporting problems with Office and Garamond, so you might look at some of the solutions offered. You could possibly copy the old Truetype Garamond fonts from an older Mac into your new one, but frankly, I'd just avoid the problem and pick a font you know is available in both programs. Also: if you "downloaded" Adobe Garamond Pro from any place other than purchasing from Adobe or activating through Typekit, it's possibly a knockoff which will just amplify your grief.
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