lowerclassman

/ˈloʊərˌklæsmən/
noun
  1. A student in the first or second year of high school or college; a freshman or sophomore.
    • The lowerclassman asked an upperclassman for directions to the science building.
    • As a lowerclassman, she was still getting used to the school's schedule.
    • The club welcomes both lowerclassmen and upperclassmen to join.