sound hardening

Because of human lazyness and the tendency to save energy, the usual direction of sound change is erosion from hard sounds to soft sounds.
list of exceptions: sound hardening

purse < bursa “leather bag” from Ancient Greek βύρσα (búrsa, “hide, wine-skin”.

The Latin suffix "-alis" dissimilated to "-aris" when the root word contained an /l/ anywhere within it. As a result, almost all English adjectives ending with "-ar" (e.g. "lunar, solar, stellar, linear, planar, polar, molecular, modular, particular, alveolar") all contain an /l/ elsewhere.

This list might have incorrect entries if the reconstructed roots are wrong

𓁶 1. Top ᵗSchopf Zopf Schöpfer Cover cephal Kopf caput *kaput 𐌷𐌰𐌿𐌱𐌹𐌸 > Haupt > hēafod > Hööft > hoofd > head