\begin{tikzpicture}[>=stealth', line width=.2em]
  \node (weak) at (0,0) {
    \begin{minipage}{8em}
      {\large\bf Class Weak}\vspace{0.5em}
      \small
      \begin{itemize}
      \item long prefix {\it n(e)d-}
      \item typical of \emph{weak} vowel initial stems: /ǒ,ə/
      \end{itemize}
    \end{minipage}
  };

  \node (sentient) at (20,0) {
    \begin{minipage}{8em}
      {\large\bf Class Sentient}\vspace{0.5em}
      \small
      \begin{itemize}
      \item requires suffix {\it -m}
      \item typical of possessed nouns for humans, animals and animate
        plants
      \end{itemize}
    \end{minipage}
  };

  \node (strong) at (40,0) {
    \begin{minipage}{8em}
      {\large\bf Class Strong}\vspace{0.5em}
      \small
      \begin{itemize}
      \item short prefix {\it n-}
      \item (historically) typical of \emph{strong} vowel initial
        stems: /a,e,i,o/
      \end{itemize}
    \end{minipage}
  };
  
  \node (chief) at (0,-12) {
    \begin{minipage}{10em}
      {\large\bf Class Chief}\vspace{0.5em}
      \begin{table}
        \centering
        \begin{tabular}{ll}
          \af{nd}okma\af{m} & `my chief' \\
        \end{tabular}
        \caption{A suffix {\it -m} is required as is a long
          prefix. Here the initial \emph{o} is /ǒ/. These are not
          overabundant.}
      \end{table}
    \end{minipage}
  };

  \node[draw,ellipse] (ellipse) at (40,-13) {
    \begin{minipage}{10em}
      \centering
      The edges represent a partial order on these classes. There is
      no ``inheritance'' in this framework. The order is relational.
    \end{minipage}
  };
  
  \node (bobcat) at (20,-15) {
    \begin{minipage}{15em}
      {\large\bf Class Bobcat}\vspace{0.5em}
      \begin{table}
        \centering
        \begin{tabular}{lll}
          \rnum & \af{n}bezhow\af{em} & `my bobcat' \\
          \rnum & \af{nde}bzhow\af{em} & `my bobcat' \\
        \end{tabular}
        \caption{A suffix {\it -m} is required but it inflects like
          both \emph{weak} and \emph{strong} classes.}
      \end{table}
    \end{minipage}
  };

  \draw[->] (chief.north) to (sentient);
  \draw[->] (chief.north) to (weak);
  \draw[->] (bobcat) to (chief);
  \draw[->] (bobcat) to (strong);
\end{tikzpicture}

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