Arg.  I had posted the code for that macro, and had forgotten to set it up 
to get only those tiddlers tagged "mot" (i.e. word), because many tiddlers 
are tagged "expressions", and I keep expressions.  And then there are other 
tiddlers that are neither a word nor an expression.

And because I'm a continuous tweaker of things, I also had to change the 
variable name in the macro.

Also, worth highlighting that the macro shows how I've gone about handling 
*dynamically 
generated filters*.

Anyways, for anybody and all interested, the new version of the macro:

\define GetWords(FirstLetterOptions)
<$vars *thisFilter*={{{ 
[[$FirstLetterOptions$]split[]addprefix<lb>addprefix[prefix]addsuffix<rb>addprefix<lb>addsuffix<rb>join[
 
]*addsuffix[ 
+]addsuffix<lb>addsuffix[tag]addsuffix<lb>addsuffix[mot]addsuffix<rb>addsuffix<rb>*addsuffix[
 
+]addsuffix<lb>addsuffix[sort]addsuffix<lb>addsuffix<rb>addsuffix<rb>] }}}>
@@.multicol
<$list variable="thisTiddler" filter=<<*thisFilter*>>>
<$link to=<<thisTiddler>>/><br>
</$list>
@@
</$vars>
\end

*Example generated dynamic filter*: <<GetWords "aâà">> 

thisFilter has the value [prefix[a]] [prefix[â]] [prefix[à]] +[tag[mot]] 
+[sort[]]
On Saturday, June 5, 2021 at 10:37:11 PM UTC-3 Charlie Veniot wrote:

> G'day,
>
> *In the code further below, I use what I know and/or what I'm comfortable 
> with.  Please, if you have code for alternative approaches, please share!  
> This post is just about sharing code for studying.*
>
> Working again on my French-Acadian dictionary 
> <https://leptitaurele.neocities.org/>, I am redesigning the way of 
> retrieving matching words per words tiddler (organized by letter of the 
> alphabet, so a tiddler for words starting with letter "a", a tiddler for 
> words starting with letter "b", etc. etc.
>
> I decided that I needed a global macro to do the job of getting all 
> relevant words for each list of words tiddler, so that I can code <<GetWords 
> a>> to get all of the words starting with "a", <<GetWords b>> to get all 
> of the words starting with "b", etc. etc.
>
> Should be easy enough with a filter that takes the macro parameter and 
> yields results of things like [prefix[a]], [prefix[b]], etc.
>
> But [prefix[a]] won't catch words starting with accented a's ( â or à ).
>
> [sort[]] has the smarts to treat accented a's as equal to "a", so sorting 
> works A-1.
>
> So for your perusal, the code I've come up with that works quite sweetly 
> with the macro call <<GetWords "àâa">> :
>
> \define lb() [
>
> \define rb() ]
>
> \define GetWords(FirstLetterOptions)
> <$vars letterList={{{ 
> [[$FirstLetterOptions$]split[]addprefix<lb>addprefix[prefix]addsuffix<rb>addprefix<lb>addsuffix<rb>join[
>  
> ]addsuffix[ 
> +]addsuffix<lb>addsuffix[sort]addsuffix<lb>addsuffix<rb>addsuffix<rb>] }}}>
> @@.multicol
> <$list variable="thisTiddler" filter=<<letterList>>>
> <$link to=<<thisTiddler>>/><br>
> </$list>
> @@
> </$vars>
> \end
>
> And the CSS for multicol :
>
> /* MULTI COLUMN MODE */
> .multicol {
>    display:block;
>    -moz-column-count:4;
>    -moz-column-gap:1em;
>    -webkit-column-count: 4;
>    -webkit-column-gap:1em;
> }
>

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