Where does “kasvos” come from?

kasvos (Finnish) comes from Finnish kasvaa, from Proto-Finnic kasvadak, from Proto-Indo-European h₂ewks-.

Ancestry of “kasvos”, step by step

Step	Language	Word	Meaning
1	Finnish	kasvaa	to grow; to grow , become; to increase, increment
2	Proto-Finnic	kasvadak	to grow
3	Proto-Indo-European	h₂ewks-	—

kasvos — Etymology, Origin & Word History | Etymology Explorer