For the German speaking markets these are the most searched keywords:
online casino
online casinos
casino
casinos
“gambling” is not a common search term.
Tipp:
target also kasino, online kasino, kasino, kasinos. This is actually the correct German spelling. These kw’s are not searched as much as the one with “C”, but are not as competitive and highly targeted as well.
Remember to target Switzerland (google.ch), Austria (google.at) and Germany (google.de).
German Expert
http://www.deutschesgrandmonaco.com
http://www.playshare.com