As nouns the difference between yoak and coak
is that yoak is obsolete spelling of lang=en while coak is a wooden dowel.
As a verb coak is
to unite (timbers etc.) by means of tenons or dowels in the edges or face.
coak
English
Noun
(
en noun)
a wooden dowel
(nautical) the brass bearing in the sheave of a block
Verb
(
en verb)
To unite (timbers etc.) by means of tenons or dowels in the edges or face.
- (Totten)