"for": regarding, concerning, pertaining to – correct.

"cases": scenarios, examples, situations – yes.

Now, I need to go through each word, decide if it's a proper noun, and if not, find three appropriate synonyms. Some words might be tricky, like "immutable" – possible synonyms could be "unchangeable|fixed|constant".

"include": comprise, feature, entail – correct.

Let me check each word again. "Use cases" – maybe "applications", "functions", "objectives"? Hmm, "use cases" are specific scenarios, so maybe "scenarios", "applications", "examples" are better.

Now process each word except "Buffer RDD" (proper noun).

"aggregation": collection, consolidation, gathering – yes.