I'm not talking about onomatopoeia—I don't mean a word that describes a sound—I mean something along the lines of an aptronym, i.e. a perfect name such as Anthony Camera for a photographer (true story). What is the word for when a word just sounds like exactly what it means? I heard the word for this once, long ago, and have since forgotten it.
"Push" and "Pull" might be examples, in that the sounds they form evoke the physical actions denoted.