Some English words are oddly formed. For example, it’s clear how to build nouns from nouns by adding -ship, much like with -hood:
friend – friendship
member – membership
censor – censorship
there are quite a few of these (http://www.morewords.com/ends-with/ship/)
But then dealership – dealer loses out (because dealer is already taken).
Or take the verb to pass on the road, it seems like it means “to let pass,” but it actually means “to overtake.”
(I study traffic rules in the evenings. Looks like I have an exam on Saturday)
UPDATE: on Tuesday. I have a conference in Philadelphia on Saturday. And they have holidays on Friday and Monday!
