My personal nemesis is "mroe". Also aliased. My wife, who drafts a lot of legal contracts, has a problem with "doe snot", which the spelling checker is more than happy with.
A friend of mine aliased `git status` `git statsu`; I, being lazier, chose `git st`. Any time saved I lost by not copying his other alias, `c = commit -amSTUFF`...
for me it's "date" and "data" since I type both of those quite a lot (I don't have a clock on my desktop, I just use date when I need to know the time, I find a clock distracting because I get that "well it's 27 minutes til that meeting, never getting in the the zone in that time, better check HN" thing).