There are several ways:
Terve
Hyvää päivää
Päivää
Moi
Hei
On the Telephone it's "Haloo"
Hei, moro, moi, terve (there are many more but those are very common)
On the phone: Haloo
Hello I am Leland:Hei, nimeni on Leland.(Literally Hi/Hello, my name is Leland.)
hello my aniseed cupcakes = hyvää päivää aniksensiemenvuokaleivokseni
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.
"Hei, olen Kate"
Pleb is not a Finnish word.
Coal is hiili in Finnish.
Rain is sade in Finnish.
Little is pieni in Finnish.