UNIQUE WORDS game to increase our vocabulary - alphabetical order

yenta  gossip or busybody

antithetical--sharply contrasted in character or purpose

Looking at the clock leads to two things antithetical to sleep, Grandner says — math and worry.
Washington Post (Jun 10, 2013)

effervescent - someone who's enthusiastic and vivacious. Or your Coke can be defined that way. Bubbly

gelasin: dimple in the cheek when one smiles.

Jackalope  - a mythical animal and a cross between a jackrabbit and an antelope, goat or deer.