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I don't really understand the inner working of synonyms and merging, so perhaps I misunderstand what this means, but that's like merging Windows and Windows-7. DFS is a banner for two related technologies: DFS-R and DFS Namespaces. DFS and DFS-R are not analogous.
I agree with @MDMarra - if someone told me to investigate DFS, I would not assume they were referencing replication and vice versa. Though close, they are distinct.
@MDMarra I added dfs-r because it was more relevant. I removed DFS as there was no evidence of a question related to namespaces. And yes I wish people would use DFSN or DFSR specifically. But they dont and when DFS is mentioned, clarification is often required.