Red and purple.
As languages add colour words to their lexicon, the colours a word refers to can get shifted around. Portuguese roxo, related to the same Proto-Indo European (PIE) word reudh, used to mean red and red-related colours, including pink, orange, and purple. When the bright red pigment vermilion was imported from China, Portuguese began using vermelho to refer to red, and pushed roxo aside to refer exclusively to purple. (here)