Modern Icelandic maður is from Old Icelandic maðr.
To relate the latter to the former, I would say "Old Icelandic maðr is the ___ of Modern Icelandic maður." What linguistic term goes in the blank?
Is there another term for a meaning the other way round, i.e., that fits the blank in this sentence: "Modern Icelandic maður is the ___ of maðr."
I thought about ancestor for the first blank and descendant for the second, but I am not sure if this is correct linguistic terminology.