Good overall, but I don't think "Greetings" fits in its group. "Greeting" would.

Greetings as a plural is an unkosher red herring.

Not too tricky but fun. I am obviously old fashioned but greetings seems perfectly correct to me and a good red herring

The problem is that "greetings" works fine in the red herring group, but "greetings card" isn't a thing.

Err, Greetings Card is very much a thing. Not sure where you're from, but it's a perfectly normal everyday term in the UK, at least.

Greetings card is 100% a thing. I managed to get them all anyway and within about 90 seconds. Great grid, nice red herring.

Excellent wall. I concur Greetings Card is absolutely fine.

I'll take your word for it. I did a search before I posted the comment because I thought it could be a regionalism, and found basically no usage of "greetings card" in the wild. The most prominent UK source I found at www.gca.cards does not use the plural, and even the business called "The Greetings Card Company" is "the UK’s leading online greeting card shop!"

I guess it shows that spoken language does not always permeate the written world as much as one might think.

nice

All seemed fine to me