You can make up a good word in several ways:
A stupid, made-up word. The same can be said more efficiently with "good."However, good would not make for a very interesting song.
Good spelling! That word came from a song in the kid's movie, 'Mary Poppins', and is completely made up.
Supercalifragilisticexpialidocious is a made-up word popularized in the movie "Mary Poppins." It is used to express a feeling of joy or excitement, or to indicate that something is extraordinary or exceptionally good.
I made up the word fish NOW EVERYONE BOW DOWN TO ME :p
neologism
A word made up of two other words is called a compound word.
No, "pactisly" is not a recognized word in the English language. It might be a misspelling or a made-up term.
Rick Riordan had made up the word skewered as you can see in the book The Lightning Thief.
made up of visible parts
The (Ford) Mondeo has no meaning to it whatsoever. Ford made the word up and it was used as it sounded good and was easy on the tongue
A made up word.
A word that you made up.