If it's a proper noun, like the ESPN show or the software, GameDay is one word, but it has both the G and D capitalized. If it isn't, and you're just saying the day that the game will be on, then it is two words.
The proper use of this term is to use two words. "Game day" is describing a certain day, it is not a specific noun in and of itself.
It is two words. Writing it as one is acceptable in the UK and is referred to as a "Britishism." But in American grammar, it is always two separate words.
Two words - "one day".
It is two words take it from a 7th grader
I recommend class work, as two words.
It is two separate words.
College GameDay - football - was created in 1987.
The duration of College GameDay - basketball - is 2 hours.
The duration of College GameDay - football - is 3 hours.
"ESPN College GameDay". Ref: http://sports.espn.go.com/ncf/news/story?id=2209205
I Am The Champion by; B.O.B.
College GameDay - basketball - was created on 2005-01-22.
College GameDay - 1986 was released on: USA: 1986
You can view NFL GameDay online at the NFL website. You can also view it by purchasing any of the games titled NFL GameDay released between 1995 and 2004.
NFL GameDay Morning - 2006 was released on: USA: 1 September 2006
NFL Gameday Morning - 2008 was released on: USA: 1 September 2008
It is two words. Writing it as one is acceptable in the UK and is referred to as a "Britishism." But in American grammar, it is always two separate words.
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