Since this thread was started, nearly 4 years ago,
spadework has come up twice more as the 9-letter word of a daily puzzle (with different mandatory letters). So perhaps by now everybody has become familiar with the word, even if they weren't before. Still, I'd like to resolve the question of whether it's really a common word.
The evidence from the News on the Web corpus doesn't support the idea that the word is noticeably less often used in America than in Britain. But what it does show is that the word isn't used all that frequently in either country: United States, 0.03 times per million words; Great Britain, 0.04 times per million. Generally it is used in the figurative sense of preparatory tasks. For example, a 2015 CBS News item quoted a State Department spokesman as saying, "But we do believe through a lot of hard diplomatic spadework that we have made progress." I did see one story from the British
Telegraph where the word was used about people digging up their gardens.
I would have thought that the word is quite common, but it looks like I'm wrong. In any case, wherever there is doubt, I prefer to come down on the side of classing a word as rare. This applies especially to a 9-letter seed word. So
spadework will be treated as rare in future - which means, in practice, that you won't be seeing it again.
Possibly the reason I thought the word was well known is that it was something of a favourite of P G Wodehouse, dozens of whose books I have consumed over the years. Who, having read it, could forget this passage from
Jeeves in the Offing?
'I was looking for a mouse.'
'A mouse?' she said, 'What do you mean?'
Well, of course, if she didn't know what a mouse was, there was evidently a good deal of tedious spadework before us...
Here are some other uses of the word by Wodehouse, that I could locate by googling. There may be others.
Last night Chuffy wounded her deepest feelings, and it's going to take a lot of spadework to bring her round.
It seemed to me that what you might call the preliminary spadework had been most satisfactorily attended to...
'I see what you mean. You will sort of pave the way, as it were.'
'That's right. Spadework.'
Preliminary spadework must be put in.