I already looked it up, I am just curious if people mostly see the word the same way. I hadn't paid attention to this one, I just write 'thank you' because that's what I thought my spellchecker was teaching me. Then I decided to look it up. The answer makes sense, but why wouldn't such a common word as the noun, thankyou, be in the spellchecker? It's not in Word, Scrivener or the forum spell checkers. Before I add it, I thought I'd see what other people here know about the word(s).