The cabinet men are all officials in what words mean, both in their dictionary definitions and in specific contexts. In this sense, they’re almost walking dictionaries. However, this doesn’t mean that their logic is sound—saying that something had to grow on trees, and that it may as well be words, is questionable at best. The fact that the crowd cheers at the “display of logic” then suggests that in Dictionopolis, as the minister says, nothing has to make sense. Individual words may have to mean the right thing in context, but the overall message of what someone is saying doesn’t have to be reasonable at all.