classmate (n.)
- ace
- amigo
- associate
- bedfellow
- buddy
- bunkmate
- butty
- chum
- colleague
- companion
- company
- compeer
- comrade
- confrere
- consort
- copartner
- crony
- fellow
- gossip
- infant
- kindergartner
- mate
- messmate
- pal
- pard
- pardner
- partner
- playfellow
- playmate
- preschooler
- roommate
- schoolboy
- schoolfellow
- schoolgirl
- schoolmate
- shipmate
- sidekick
- tablemate
- teammate
- workfellow