When you're looking for alternative ways to describe a dense and lush area of growth, there are a variety of terms to choose from. Instead of using the phrase "thick growth," you could say "dense foliage," "luxuriant growth," or "voluminous vegetation." Other possibilities include "dense forest," "overgrown thicket," and "impenetrable jungle." The word "thick" itself can also be replaced with similar terms, such as "dense," "thronged," or "crowded." Whether you're writing about a lush garden or a dense wilderness, there are many expressions you can use to better describe the scene.