Are the words enormous and colossal synonyms?

Yes, "enormous" and "colossal" are very close synonyms. They both describe something that is extremely large in size or extent.

However, there can be subtle differences in usage:

* Colossal often implies a greater sense of awe and grandeur, suggesting something truly massive and impressive.

* Enormous emphasizes the sheer bigness of something, sometimes highlighting its unwieldiness or overwhelmingness.

Ultimately, the best choice depends on the specific context and the nuance you want to convey.