Excellent point!
I went with group / but I wouldn’t have seen that prefix side-effect until I tried it out. I don’t use template part / because I’m stubborn and it’s ugly… but my components certainly use a generic variable that needs to stay stable. I usually create a little get-example-data.php file to organize the fields into variables so I can use them in many contexts.
<example-card>
<h2 class='title'><?=$title?></h2>
</example-card>
