'Onomatopoeia' is a reasonably common word used to describe words that sound like the sounds they're used to describe. I was wondering whether there was an analogous term for words that sound like what their meanings look like — words like 'glint' or 'shimmer'.
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An ideophone — a word that sounds like its idea or concept.
It's quite a general term that could include onomatopoeia. There are other terms for certain types of sound symbolism.
John Lawler has some works on phonosemantics, which connect the meaning of words to the way they sound. I think that Bouba/Kiki, onomatopoeia and the OP's question can be seen as special cases of phonosemantics.
Perhaps @JohnLawler himself can drop by and explain much better than me. :-)