Rough, sharp, or irregular
A worn out or old vehicle
Placing two objects side-by-side for comparison
One who performs as a fool
Immature or simplistic; dull
Jaded
Jagged
Jalopy
Jape
Jaunty
Jejune
Jeopardy
Jester
Jettison
Jibe
Jingoistic
Jubilant
Judicious
Junta
Juxtaposition
Correct!
Incorrect
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A dictatorship is necessarily a rule by one person and a junta is a ruling group analogous to a committee or council.
Very often junta is used to describe the group of officers who take power after a military coup d'état especially in Spanish or Portuguese speaking countries in Latin America. This would be a military junta.
the definitions for jaded and jettison are a bit dodgy as well. but i'll leave those to others to explain.
Apart from these quibbles great quiz. I really enjoyed it.