Now this is a find. One of the provisions of Washington state's enabling act for corporations sole--more on this topic to come, I'm sure--provides that the corporation sole's property is held in trust for the purpose, benefit and "behoof" of his [sic] denomination. Behoof! I had no idea there was a noun form of this word, but a google search turned up 27,600 hits. Wow.
As a former student of irregular nouns and verbs, I'm fascinated to see the hoof=>hooves transformation when the noun turns into a verb. As a current student of clear writing, I'm disappointed to see that a statute in existence in 2005 still uses a word like "behoof" that adds no clarity to the preceding noun string in the sentence.