I love words that children make up on their own. Words I could correct but how boring would that be? There are of-course times when we tell them how to pronounce things properly but other times, it's too sweet to think of changing them.
We have a large set of magnetic bars and marbles that have provided hours of enjoyment. Sunbeam used to call them "mars and barbles" and instead of correcting her we all call them mars and barbles now.
The other day one of them asked me what an "optomentist" is. Meaning optimist. One of the older ones heard it and told her an optimist is someone that is always looking on the bright side of things. A pessimist is someone who looks on the dark side, so an optomentist must be someone who cheerfully expects bad things to happen. I loved the definition but don't expect to have very many opportunities to use that word.
Does your family use words that aren't really words?