Swammerdami
Squadron Leader
Evolution in languages (rather than in the humans speaking those languages!) is an interesting topic.
To start, consider Phonestheme
Here's a paper which takes an "ecological" approach to linguistic analysis. The second half of the paper has many examples of English-language phonesthemes.
To start, consider Phonestheme
Does "gl-" remind of 'light' a priori, or did a few such connections develop by chance and then drive further word development?. For example, the English phonestheme "gl-" occurs in a large number of words relating to light or vision, like "glitter", "glisten", "glow", "gleam", "glare", "glint", "glimmer", "gloss" ...
[or] "sn-", related to the mouth or nose, as in "snarl", "snout", "snicker", "snack" ...
[or] "sl-", which appears in words denoting frictionless motion, like "slide", "slick", "sled" ...
Here's a paper which takes an "ecological" approach to linguistic analysis. The second half of the paper has many examples of English-language phonesthemes.