Creole is not a dialect of the French Language and monolingual Francophones cannot understand the language.
It is a language with its own grammar, syntax and orthography which makes it distinct from French or any other language it may resemble; the notion that Creole is an inferior language is a colonial inference and is not based on linguistic fact.
Concerning vocabulary, 90% of the words come from the French language while the remaining words come from various African languages Spanish, Carib, Portuguese, and Arabic.