Today is time for what is perhaps my all-time favorite example of how sound patterns change over time. Here we go, no more delays:
The Proto-Indo-European sound k- changed into the h- sound into German (then English) — but it remained the k- sound (often spelled with c-) into Latin then Spanish. Thus we get many great parallels we’ve discussed before, such as head/cabeza. Another example of the same pattern:
The English hemp, for everyone’s favorite weed to smoke. The Spanish for the same, which we also say in English, is cannabis.
Now look closely: if we remember that the h- in the Germanic/English words maps to the c- in Latinate/Spanish words, then it becomes very clear that the h‑m-p of hemp maps the c‑n-b of cannabis. The m/n and p/b cross and change very easily between each other, so those sound changes are much more obvious.
Who would’ve thunk!