Cajun French is derived from the mixing original French spoken by French soldiers and settlers in Louisiana before the arrival of the Acadians. The language incorporates words of African, Spanish, Native American and English origin, unknown in Acadian French.
A terrarium is a small collection of miniature plants that are grown inside a clear container. The terrarium is sealed to create a self-contained ecosystem, in which the life processes of photosynthesis, respiration and the water cycle take place.
Vivarium - from example photo.s I've seen, I'd say a Vivarium is a terrarium with a substantial amount of live plants as well as animals. The dart frog tank example given was a good one; such tanks often have live moss, epiphytic plants such as orchids, and even attractive fungi (which aren't really plants but can be lumped with them for our purposes here).