number one is called yksi
In Finnish the word swamp is "suo".
The Finnish word for basket is kori.
Helki is not Finnish
The Finnish language is suomi (Finnish) or suomen kieli (Finnish language) in Finnish.
That word is not Finnish.
Pleb is not a Finnish word.
Coal is hiili in Finnish.
Village is kylä in Finnish.
Little is pieni in Finnish.
Rain is sade in Finnish.
Sevol is not a word in Finnish. It is most likely that you have misheard a word or thought that parts of two different words were one word. This is quite common when hearing a language you don't understand.
Servo in Finnish is a loan-word from the English word servomechanism or servo.