Cleanup of tags with similar names

Question

Gilles was nice enough to share a Data.SE query with us identifying tags with similar names, prime candidates for cleaning up and possibly synonym creation.

I consider the following to be false positives of the query:
^{Feel free to comment and disagree.}

• windows (the OS) and window (the GUI concept)
• http and https (if you use the latter, there's usually a good reason)
• video and s-video (due to how the query finds similar terms)
• parallels (virtualization software) and parallel (parallel port or doing two things at the same time)
• stack (programming and debugging) and stacks (file and folder preview in Mac OS X Dock)
• ibook (predecessor to Macbook product line) and ibooks (Apple's e-books, tag no longer exists)
• hpux / hp-ux (only the latter exists)
• file-server / fileservers (only the former exists)
• zombies / zombie (only the latter exists)
• list / lists (both no longer exist)

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That leaves the following pairs of candidates for cleanup:

1. user / users
2. port / ports
3. utf8 / utf-8
4. file-types / filetype

Any ideas how to handle those?

Discuss only one pair of tags per answer please.

Up vote answers to agree, down vote to disagree.

Answer 1

utf8 → utf-8

Merge and create synonym.

While the former is more popular as a tag, I suggest we go with the official naming here:

Other descriptions that omit the hyphen or replace it with a space, such as "utf8" or "UTF 8", are not accepted as correct by the governing standards.