-grader combines with words such as 'first' and 'second' to form nouns which refer to a child or young person who is in a particular grade in the American education system.
...a sixth-grader at the Latta School.
grader in British English
(ˈɡreɪdə)
noun
1.
a person or thing that grades
2.
a machine, either self-powered or towed by a tractor, that levels earth, rubble, etc, as in road construction
grader in American English
(ˈgreɪdər)
US
noun
1.
a person or thing that grades
2.
a pupil in a (specified) grade at a school [a fifth grader]
sometimes, in compounding, written -grader
Examples of 'grader' in a sentence
grader
I was a sixth grader again, listening in rapt attention as she made history come alive with tales from her own memories.
Pickard, Nancy NO BODY (1989)
A grader had smoothed the worst of it but wind and traffic had corrugated the surface so that the whole car vibrated.
Brierley, David SKORPION'S DEATH (1989)
With Shawna in bed and her bags packed, she felt oddly like a sixth grader on Saturday morning.