We had some laughs around our house when we got four inches of snow two days ago because some weather forecasters had declared last week 'meterological spring' for our part of the country. Now we're not getting into the skills or lack thereof when it comes to predict the weather. But staying in the joking mood, two of my son noticed our cat was doing a lot of shedding and they declared it cateological spring. You get the meaning which is really helpful when it comes to a made up word.
Spell check doesn't smile much at those made up words when we use them but when you write fantasy or scifi, chances are you've made up some words. Maybe the words are for a type of magic or a futuristic spaceship engine or propulsion method.
In my upcoming epic fantasy, First Dragon, there are two opposing religious and political beliefs. Umbron is the spiritual leader of one sect and Bellam is the leader of the other. Yes, I think I made those up. I'm using more made up words and names but I'll talk about those someday when I can actually announce the release of that book.
Many authors use made up names. I prefer those words make some sense so I can remember what they mean. I also like them to be pronounceable.
Do you use made up words? Do you mind seeing them when you're reading? Are there cases when it bothers you?