I tend to be a bit pedantic, so I would refer to lobster, oyster, shrimp, clam, squid (and I'm sure much more, including fish) as 'seafood', and things like tuna, salmon, whitefish, cod, and others as fish (but also seafood). And of course, to me, those are all 'meat'.
But honestly, I don't have to worry about it quite so much, since I tend to avoid such foodstuffs as I find dead cow parts much preferable. Especially when aged or served on skewers, or possibly both :-)
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