The English language has more words in it than I personally think is necessary. The vocabulary is so big, experts can only guess at how many words there actually are. That's because language is a changing thing, something that's always evolving. You can actually force some of those changes yourself. You just need to know how to make a word.
The Right Words
I'm not a big fan of inventing words, because like I said the language is already too big, but if you're going to do it you may want to try using a formula. There's a really easy way to invent new words, and people have been using it for years. Just add -ish.