round vs turn

round and turn both are nouns.

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

As nouns, round and turn are synonyms defined as:

round and turn: (sports) a division of a game during which one team is on the offensive

Other synonyms of round include bout.

round (noun)	turn (noun)
(often plural) a series of professional calls (usually in a set order)	the act of changing or reversing the direction of the course
the usual activities in your day	the act of turning away or in the opposite direction
the activity of playing 18 holes of golf	taking a short walk out and back
any circular or rotating mechanism	a favor for someone
a charge of ammunition for a single shot	(game) the activity of doing something in an agreed succession
a crosspiece between the legs of a chair	turning or twisting around (in place)
a partsong in which voices follow each other; one voice starts and others join in one after another until all are singing different parts of the song at the same time	a short performance that is part of a longer program
an outburst of applause	a movement in a new direction
a cut of beef between the rump and the lower leg	an unforeseen development
a serving to each of a group (usually alcoholic)	a circular segment of a curve
a regular route for a sentry or policeman	(sports) a division of a game during which one team is on the offensive
the course along which communications spread	a time period for working (after which you will be relieved by someone else)
(sports) a division of a game during which one team is on the offensive
an interval during which a recurring sequence of events occurs

round (adjective)	turn (adjective)
having the shape or form of a circle
(of sounds) full and rich
(mathematics) expressed to the nearest integer, ten, hundred, or thousand

round (verb)	turn (verb)
become round, plump, or shapely	twist suddenly so as to sprain
make round	change to the contrary
bring to a highly developed, finished, or refined state	go sour or spoil
express as a round number	pass into a condition gradually, take on a specific property or attribute; become
pronounce with rounded lips	undergo a transformation or a change of position or action
attack in speech or writing	change color
wind around; move along a circular course	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

round (adverb)	turn (adverb)
from beginning to end; throughout