This is the 9th most frequent Finnish word.
voi
The Finnish word "voi" means "butter" or "can/may" (as a verb).
Here, 'voi' is an interjection, expressing an exclamation or strong emotion.
Voi kuinka kaunis päivä tänään on!
Oh, what a beautiful day it is today!
In this case, 'voi' is a verb, meaning 'can' or 'to be able to' in this context, indicating well-being.
Hän voi todella hyvin nyt.
He/She is doing really well now.
Here, 'voi' is a noun meaning 'butter', referring to the food item to spread on bread.