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First the client gave us a list of keywords, which includes terms like "cinema seatings, stadium seatings, hall seatings", etc., but when I checked Overture keyword suggestions and found out these terms (or related terms) are often used by people who want to find seating chart of those places and book tickets or make reservation of seats.
Since I'm not a native English speaker, I'm not sure if those keywords provided by the client is the real term to refer to the products. So I do need suggestions from native English speaker. The keywords are too important to be used casually in a PPC campaign anyway.
Please help!
I'd try browsing the related categories at ODP and see what the editors put in the descriptions, in addition to looking through the sites in the category. For as little as they're worth, a lot of sites still cram keywords meta tags full of keywords and synonyms, so it wouldn't be a bad idea to check source code to look at those for ideas.
If you can hit the right search at Teoma, that can be a good source to research related sites and what terminology they're using.