\begin{tikzpicture}[>=stealth']
  \matrix[column 1/.style={nodes={text width=8em,text ragged}}] at (-2,0)
  {
    \node {$ride\leq beat$}; \\
    \node {$ride\leq abide$}; \\
    \node {$strive\leq abide$}; \\
    \node {$strive\leq weak$}; \\
  };
  \node (en) at (0,1) {$beat$};
  \node (enove) at (1.5,0) {$ride$};
  \node (ove) at (3,1) {$abide$};
  \node (oveed) at (4.5,0) {$strive$};
  \node (ed) at (6,1) {$weak$};
  \draw[->] (en) to (enove);
  \draw[->] (ove) to (enove);
  \draw[->] (ove) to (oveed);
  \draw[->] (ed) to (oveed);
\end{tikzpicture}

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