This is clearly subjective, but some words really sound like the thing they describe (personal favorites: puffin; bulbous; fidgeting). Do you have an example of such a word (or, alternatively, of a word that sounds like the exact opposite of what it refers to)? What do you think creates this effect?
At first glance, I can’t think of any words that are like that. I think that works because of the word-image associations our brains make… It’s all very sciency.