Be sharp as one and your wit is keen. In a block they can be seen.

What do you call a fish wearing a bow tie?

A slightly mixed up brain could have this name

I sit in the kitchen to hold your hot soup. Also a game for a fun-loving group. Go for strikes at the end of the lane, Or eat from my belly, tho that sounds insane

This four letter word can be an animal, but you might also use a wax version of me to close a letter. I can sometimes be airtight, or you might even talk about a lab being hermetically ____ed