tour vs turn

tour and turn both are nouns.

Word	Noun	Adjective	Verb	Adverb
tour	Yes	No	Yes	No
turn	Yes	No	Yes	No

As nouns, tour and turn are synonyms defined as:

tour and turn: a time period for working (after which you will be relieved by someone else)

Other synonyms of tour include go, spell.

tour (noun)	turn (noun)
a journey or route all the way around a particular place or area	the act of changing or reversing the direction of the course
a time period for working (after which you will be relieved by someone else)	the act of turning away or in the opposite direction
a period of time spent in military service	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)

tour (verb)	turn (verb)
make a tour of a certain place	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