Which other variables can be used in the keyword url?

[Janvs]

Some of our customers use in the keyword URLs different variables, EG:
http://www.something.com/something.html?label=keyword1234{ifContent:C}{ifSe arch:S}{creative}

Keywordxxxx is used to link the conversion to a certain keyword, and with the {creative} it is possible to link it also to a creative. But are there any other variables that i can use??
I am investigating other ways to link conversions to the keyword, so i was wondering if there are variables like {group} or {keyword}

[blacksmith]

there is one that I use ?kw={keyword} not sure if that any help.