As nouns the difference between yoak and yoik
is that yoak is obsolete spelling of lang=en while yoik is a traditional style of Sami singing or chanting.
As a verb yoik is
to sing in a traditional Sami style.
yoik
Noun
(
en noun)
(music) A traditional style of Sami singing or chanting
Verb
(
en verb)
To sing in a traditional Sami style