I have a font that already comes with a smallcaps variant.
How do I define it?
I've tried the following, which I think should work from the documentation I've seen, but doesn't:

\starttypescript[serif]                            [garamond]
    \definefontsynonym[Serif]                    [file:/home/joel/.fonts/12/EBGaramond-Regular.otf]
    \definefontsynonym[SerifBold]                [file:/home/joel/.fonts/12/EBGaramond-Bold.otf]
    \definefontsynonym[SerifItalic]                [file:/home/joel/.fonts/12/EBGaramond-Italic.otf]
    \definefontsynonym[SerifBoldItalic]            [file:/home/joel/.fonts/12/EBGaramond-BoldItalic.otf]
    \definefontsynonym[SerifCaps]                [file:/home/joel/.fonts/13/EBGaramond12-AllSC.otf]
\stoptypescript

\starttypescript[sans]                            [garamond]
    \definefontsynonym[Sans]                    [file:/home/joel/.fonts/12/EBGaramond-Regular.otf]
    \definefontsynonym[SansBold]                [file:/home/joel/.fonts/12/EBGaramond-Bold.otf]
    \definefontsynonym[SansItalic]                [file:/home/joel/.fonts/12/EBGaramond-Italic.otf]
    \definefontsynonym[SansBoldItalic]            [file:/home/joel/.fonts/12/EBGaramond-BoldItalic.otf]
    \definefontsynonym[SansCaps]                [file:/home/joel/.fonts/13/EBGaramond12-AllSC.otf]
\stoptypescript

\starttypescript[garamond]
    \definetypeface[garamond]                    [rm][serif][garamond][default]
    \definetypeface[garamond]                    [ss][sans][garamond][default]
    \definetypeface[garamond]                    [mm][math][modern][default]
\stoptypescript

\starttext

    This is regular text.

    {\smallcaps This should be in smallcaps.}

    {\WORD This should be regular text, but capitalized, not really smallcaps.}

\stoptext
--Joel