(My message is a bit related to an old and now closed discussion from 2006 :
- Moodle and MediaWiki integration ?
Just to say that in the French Moodle.org forum, someone has made the suggestion since 2016 to use or even, to embed / embark, Wiktionary in Moodle...
So I would just underline that teachers may wish to use the content of the free and open-source online dictionary Wiktionary. For instance, especially the Spanish Wiktionary (Wikcionario) : es.wiktionary.org
for teachers of the Spanish language.
Wiktionary is a common worlwide dictonary. And Moodle teachers can complement it by their own public or private thesaurus and specific profesional glossaries (using the Moodle glossary functionality, of course !)