In UK there are three registered trademarks (that I can find) shown below.
This is simply joining two very common words together in an obvious way - "Fun" and "World".
I would imagine you could use it to start your own business. You can even register them as a trademark if you so wanted - proving not in same class as those already registered.
This is what makes the whole thing a pathetic joke:
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You can register the word as a trademark - but you cannot register it as a domain name.
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These individuals in authority (UN WIPO, US DoC and ICANN) are either stupid morons - or corrupt. I include the lawyers in this.
My money is on the latter.
If you are not encroaching into the registered trademarks business, I can see no lawful reason for them to take it away from you.
I think they will try - and with the corrupt UDRP system, using trademark overreach, they will likely win.
It is not impossible for you to win.
Take two other common words "Play" and "UK".
I have sent off Play UK (the Sky TV channel) solicitors (wiggin.co.uk) with a flee in ear. They tried to take PlayUK.co.uk off my friends son.
This is informed opinion - IANAL. The system is corrupt - I have no wish to be held accountable for their corruption.
CASE DETAILS FOR TRADE MARK 2062872
Mark Text : FUN WORLD
Class: 16
Registration Date: 01.05.1998
Next Renewal Date: 22.03.2006
Class 16:
Paper; envelopes; cardboard; boxes, files, folders; cards, greeting cards, tags,
bags; pens, pencils, erasers, pencil sharpeners, rulers, geometry equipment;
compasses, stationery, stationery products, staplers, staples; drawing pins;
adhesive tape; pencil cases; pen and pencil holders, and containers.
Proprietor: Hamelin Stationery Limited - Calderbank,River Street,Brighouse,West Yorkshire,HD6 1LU
DETAILS FOR INTERNATIONAL CASE M669619
Mark Text: Fun World
Class: 09
Date of Designation in UK: 07.11.1996
Class 09:
Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments; apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity; apparatus for recording, transmission or reproduction of sound or images; magnetic data carriers, recording discs; automatic vending machines and mechanisms for coin operated apparatus; cash registers; calculating machines, data processing equipment and computers; fire-extinguishing apparatus.
Includes computer hardware and firmware; computer software (including software downloadable from the Internet); compact discs; digital music (downloadable from the Internet); telecommunications apparatus; computer games equipment adapted for use with TV receivers; mouse mats; mobile phone accessories; contact lenses, spectacles and sunglasses; clothing for protection against accident, irradiation or fire.
Does not Include printed computer manuals which are in Class 16, self contained computer games equipment which is in Class 28, various electrical items (e.g. electric screwdrivers are in Class 7 and electric toothbrushes are in Class 21).
DETAILS FOR COMMUNITY TRADE MARK E556167
Mark Text: funworld
Classes: 09 28 41
This is for stylised word: A word presented other than in a regular typeface.