I was just thinking about this this morning. What the heck is with the "-er" suffix?
"I'm a witcher."
"What does a witcher do?"
"I ~~create~~ ~~watch~~ ~~catch~~ ~~breed~~ ~~f***~~ hunt witches."
"I'm a birder."
"What does a birder do?"
"I ~~create~~ ~~catch~~ ~~hunt~~ ~~breed~~ ~~f***~~ watch birds."
"Actually I think several of those could apply..."
I think the confusing-ass formula is this:
A [word1]er is a [word2]er of [word1]s.