As far as worldbuilding goes- it’s important to remember that language is an outgrowth of culture, which is affected by setting. In other words, cultures, and thus languages, evolve differently depending on geography and external influences.
Languages are coherent. It makes no sense to have the word for ‘bread’ sound like ‘Xwixhtltl’ if your word for ‘city’ sounds like ‘Enirtheu’, unless your culture has been overwhelmed by invaders with extremely different language patterns.
Things to consider.