This is a really fun one. So 鑿 means “to chisel” or “to bore a hole” and 井 means “a well”. Simple enough. I love the complexity of the character 鑿. Etymologically it is quite a melting pot. I’m not going to go completely into its etymology, maybe in a future post, but for now you can content yourself with this.
Unfortunately, I found no fonts that could display the second character here so I decided to use 小篆 pictures instead. With each arrow, a new grapheme is removed. Also, 金 is the semantic component for 鑿, the phonetic component is the character below it only without the 米. When it combined with 金, the 米 was replaced. Confused? Good.^^ That character’s pronunciation is ㄗㄨㄛˋ(zuò), which is the second pronunciation for 鑿.
As for 井, it is simply a pictograph of a well.
丵 which means “thick grass” and 凵 which means “receptacle”.