I was looking into the etymology of plasma, to see how a single word could encompass a crucial element of blood and also a state of matter. Apparently, the phase was named after the blood fluid, because plasma is what blood cells are suspended in, and in plasma, electrons are stripped from their atoms, suspended and free-flowing. So the etymology is sort of contrived.
However, in researching this, I came across two terms: heteronyms and polysemy. Heteronyms describe a word for homonyms words spelt the same, pronounced differently, with different etymologies and different meanings, that make them different words. An example would be bass (guitar) and bass (fish). Polysemes on the other hand are words that are spelt the same, pronounced however the hell, with one etymology, but still different meanings. An example would be present (gift) and present (here). Another would be man (take place at a station) and man (an adult male), where the former was derived from usage of the latter, (a man at a station => man the station). So the etymology of the word is similar/identical between the two but they form different meanings for the same word.