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The 16 words below may be partitioned into 4 groups of 4 thematically connected words.
What are those connections and groups?

Wall of words


Text version:

SHIFT OPTION RED FLAP
BLACK BOOK LANE CONTROL
STOCK SPARROW FRA GREEN
BOND NAVY ALTERNATE SHAFT

The puzzle format is from BBC Television's quiz show Only Connect.
This wall is probably more suitable for Puzzling.SE than the show (although the shows are tough).

Hints:
Currently correctly identified groups and who found them:

Shift, Option, Control, Alternate identified as (1) by M Oehm

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Black, Red, Lane, Stock identified as (2) by ArgumentBargument

If you look at this information (including removal of the possibility of other, incorrectly identified, groups), please do upvote their finds! (Infact, do if you look at their spoiler text also).

Brent Hackers' Bounty Hint

One of the remaining groups

...is connected by a property of something often seen here and there on Puzzling, sometimes in the puzzles, sometimes in comments, and occasionally even in chat; have a look around and see what is the same - I really do hope it does not irk/vex.

bobble
  • 10,245
  • 4
  • 32
  • 80
Jonathan Allan
  • 21,150
  • 2
  • 58
  • 109
  • 1
    @Sid - also as a word it is a title of address for a friar in the Roman Catholic Church (Like, "ehhhhh, 'sup fra!") – Jonathan Allan Aug 03 '16 at 06:28
  • 3
    Not making it easy for us eh. At least on the show they get to try random things and see what sticks then explain why later. :P – James Coyle Aug 03 '16 at 08:03
  • @JamesCoyle - yeah, sorry but this isn't quick fix TV - we may as well string it out a bit :D – Jonathan Allan Aug 03 '16 at 08:04
  • Hm... I'm trying to identify the last two groups, but I can't figure out what to do with FRA... – Deusovi Aug 03 '16 at 23:44
  • @JamesCoyle I have identified some now... – Jonathan Allan Aug 03 '16 at 23:50
  • Maybe Fra could have a prefix or a suffix which could be applicable for all the words in the same group.... – Sid Aug 04 '16 at 17:28
  • I don't suppose you're contemplating giving any more hints? Maybe an extra couple of words that could belong to the remaining two groups? I'd really like to award that bounty and I'd really REALLY like to know what the answer is... – Brent Hackers Aug 12 '16 at 04:57
  • 1
    @BrentHackers Heh what timing - I was just adding one :D – Jonathan Allan Aug 12 '16 at 05:00
  • 1
    Aha! Your hint gave it to me. – Deusovi Aug 12 '16 at 05:18
  • i like the last line of the last hint soooooo much... +1! – Omega Krypton Mar 03 '19 at 14:07