1) Accomplices 2) Bands of peers 3) Colleagues 4) Companions 5) Cronies 6) Pals 7) Roman military units 1) Pals 2) Partners in crime 
Pupils are banded together into a cohort defined by their age. For example, the cohort that is styled year 1 this year will be year 2 next year, and year 3 in two years' time.