# Only Connect Unchained

The 16 words below may be partitioned into 4 groups of 4 connected words.
Additionally, each of the four groups can be represented by a single group-word.
Finally, the four group-words are connected by a single five-letter word.

    +--------------+--------------+--------------+--------------+
|     SEA      |     SKY      |     DOWN     |    UNDER     |
+--------------+--------------+--------------+--------------+
|    CROSS     |     EYES     |    SCREEN    |    MYTH      |
+--------------+--------------+--------------+--------------+
|    DRIVE     |     HOME     |    BRONCO    |    TYPE      |
+--------------+--------------+--------------+--------------+
|    BOOM      |     GANG     |     QUA      |    BLOCK     |
+--------------+--------------+--------------+--------------+


Can you identify the four groups and the associated group-words?
What is the five letter word that links the group-words together?

This wall can be resolved into the following four groups (with explanations for some of the less immediately obvious ones):

Group 1: BUSTER

- Bronco BUSTER - one who breaks wild horses to the saddle (alternatively, a wrestling move!);
- MythBUSTER - a person/book, etc. that sets out to prove something commonly believed to be true actually is not;
- GangBUSTER - a law-enforcement officer who breaks up criminal gangs;
- BlockBUSTER - a hit movie (for example) that enjoys huge commercial success.

Group 2: WRITER

- ScreenWRITER - a person who writes a screenplay;
- UnderWRITER - a person or company that undertakes to finance or otherwise support or guarantee something;
- TypeWRITER;
- SkyWRITER - one who writes messages in the sky using smoke emitted from an aeroplane.

Group 3: TOWN

- HomeTOWN;
- DownTOWN;
- BoomTOWN - a community that undergoes sudden, rapid development and growth;
- CrossTOWN - situated at opposite sides of town.

Group 4: TRAIN

- QuaTRAIN - a four-line stanza in poetry;
- EyesTRAIN - fatigue of the eyes;
- SeaTRAIN - a band and shipping company;
- DriveTRAIN - part of a vehicle.

Furthermore, these four groups can be linked by the word:

GHOST

- GhostBUSTER - Who ya gonna call?!
- GhostWRITER - a person who writes a book or piece of writing on someone else's behalf;
- Ghost TOWN - deserted settlement;
- Ghost TRAIN - fairground ride.

Ghosts are often depicted with clanking CHAINS, and the song 'UNCHAINED Melody' featured in the Patrick Swayze film, Ghost...

• Just barely beat me to posting the answer - nice! I got stuck on "touch" for too long... – Deusovi May 5 at 21:57
• @Deusovi We do have a very slightly different answer though - SEA and CROSS in different groups! – Stiv May 5 at 21:58
• Huh, so we do! Interesting - I was pretty confident in CROSS, but not sure at all about SEA. I like yours better, but Google confirmed that SEA in the position I had it was a thing. – Deusovi May 5 at 22:00
• @Deusovi It was QUA that stuck me for ages. I was going down the Latin route for far too long! – Stiv May 5 at 22:02
• Nice work. My original intention with cross/sea was what you've written but both answers here are great. – hexomino May 5 at 22:48

The groups are:

Group 1: QUATRAIN, EYESTRAIN, CROSSTRAIN, DRIVETRAIN
Group 2: BRONCOBUSTER, BLOCKBUSTER, GANGBUSTER, MYTHBUSTER
Group 3: UNDERWRITER, TYPEWRITER, SCREENWRITER, SKYWRITER
Group 4: BOOM TOWN, HOMETOWN, DOWNTOWN, SEA TOWN

And their commonality is

the words that can be placed to succeed them: TRAIN, BUSTER, WRITER, TOWN. These can all be preceded by GHOST.

• My original intention with cross/sea was what Stiv wrote but this answer is also great (I just hadn't noticed the opportunity to switch them). – hexomino May 5 at 22:47