Missing words in the Golem Word Game

Is "Belgian" missing from the ENABLE word list? It is not a proper name, it is an adjective, in my understanding.

In most English-language word games, adjectives constructed from proper nouns* are not allowed. Though the rules often refer to proper nouns, the real rule is usually that if it has to be capitlaized, it's no good.

Adjectives and other words whose ancient etymology is from proper nouns but no longer refer to the object referenced by the proper noun are allowed. Those words (which constitute a large part of the language) are not capitalized.

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