noun
peer
PEER/pɪr/
A person of equal status or rank.
Each child works as an equal peer on the shared class project.

Etymology
Latin par expresses equality or being well-matched. A peer was an equal in rank, character, or status; the same idea extends to someone comparable in age or ability.
In context
if you select children of the same age and you keep them in artificial surrounding of always the same age, you increase all the negative aspects of peer pressure
More examples
- Teenagers often feel pressure to fit in with their peers.
- Other musicians regard her as a peer, not a beginner.
- As a hereditary peer, the duke holds a noble title.
Forms
peer · peers
peerless adjective — Having no equal in quality or ability.
Similar words
- equal
- Emphasizes matching ability, value, or standing rather than group membership.
- counterpart
- Usually holds a corresponding role in a different organization.