<p><strong>Noun</strong></p><ul><li>A shrewd, practical person.</li><li>Blockhead (def 1).</li><li>A freshwater fish, <em>Mylopharodon conocephalus</em>, of California.</li><li>The Atlantic croaker.</li><li>Croaker (def 2).</li><li>Hardhead sponge (def).</li><li>Hardheads, a common knapweed, <em>Centaurea nigra</em>.</li><li>Hard head (def).</li></ul>