Using WP9 and Word2000 all it did for 'mousethief" was split it in to two word. If i used at at the being of a sentence, it capitalized it as a proper name. Which word processor/spell checker were you using, btw?"Brendy' got brandy, bendy and brandi
'Maud Karpeles' came up with several: including 'mud kernel' and 'maid careless.
I did type in 'troll' and my system crashed. It could have been a coincidence. All three times.
Regards John