An area of trees and bushes growing closely together. (Cambridge Dictionary)
A dense growth of shrubbery or small trees: Copse. (Merriam – Webster)
Something resembling a thicket in density or impenetrability: Tangle. (Merriam – Webster)
A dense group of bushes or trees. (Oxford Dictionaries)
A thicket is a small group of trees or bushes which are growing closely together. (Collins Dictionary)
If you refer to a thicket of ideas or events, you mean that there a lot of them together, and often that they are confusing or difficult to identify. (Collins Dictionary)
A thick or dense growth of shrubs, bushes, or small trees; a thick coppice. (Dictionary.com)
Thicket. Your Dictionary.
Keep judges out of this political thicket.