turn vs change of course

turn and change of course both are nouns.

Word	Noun	Adjective	Verb	Adverb
turn	Yes	No	Yes	No
change of course	Yes	No	No	No

As nouns, change of course is a hypernym of turn; that is, change of course is a word with a broader meaning than turn:

turn (noun)	change of course (noun)
the act of changing or reversing the direction of the course	a change in the direction that you are moving
the act of turning away or in the opposite direction
taking a short walk out and back
a favor for someone
(game) the activity of doing something in an agreed succession
turning or twisting around (in place)
a short performance that is part of a longer program
a movement in a new direction
an unforeseen development
a circular segment of a curve
(sports) a division of a game during which one team is on the offensive
a time period for working (after which you will be relieved by someone else)

turn (verb)	change of course (verb)
twist suddenly so as to sprain
change to the contrary
go sour or spoil
pass into a condition gradually, take on a specific property or attribute; become
undergo a transformation or a change of position or action
change color
become officially one year older
have recourse to or make an appeal or request for help or information to
direct at someone
shape by rotating on a lathe or cutting device or a wheel
let (something) fall or spill from a container
alter the functioning or setting of
cause (an object) to assume a crooked or angular form
to break and turn over earth especially with a plow
to change orientation or direction
cause to move around a center so as to show another side of
cause to move around or rotate
pass to the other side of
move around an axis or a center
to send or let go
cause to move along an axis or into a new direction
channel one's attention, interest, thought, or attention toward or away from something
get by buying and selling
accomplish by rotating
undergo a change or development
cause to change or turn into something different;assume new characteristics