The word 'cluster' is both a noun (cluster, clusters), and a verb (cluster, clusters, clustering, clustered). Example uses:
Noun: The cyclists were still in a cluster as they reached the finish line.
Verb: We held our breath when the runners clustered, fearing someone would trip the others.
Race can be a verb or a noun. verb -- I will race you to the kitchen. The years seem to race by these days. noun -- Jack is running in the next race. There are two candidates left in the presidential race.
She had beaten me fair and square.
He blew a whistle to signal the start of the race.
To lose is the opposite of winning. An example sentence is: If you lose, then just try harder next time.
(someone's name) limped over to the table.
The use of cluster bombs in Iraq was proving to be extremely deadly to the American troops.
There was a cluster of stars that the astronomers were studying carefully.
the race was consolation
Syria's government use the cluster bombs to annihilate the Syrian citizens
Did you see that cluster in the corner?
The race for the office of Mayor is on!
there are a group of stars that are cclose together
I came second in a race
I was reluctant when I came in last place for a race.
"That horse went in the paddock before the race"
They were overcome with exhaustion after their race up the hill.
There was a cluster (a lot) of balloons at my friends party, must be because she's turning 13.