Noun
underclassman (plural underclassmen)
(US) A freshman or sophomore in a high school or college or equivalent.
The underclassman earned Division IV second-team honors after the all-Ohio list was recently released by the Ohio High School Baseball Coaches Association. Source: Internet
Liddell played against all three players in high school as an underclassman and finds it amazing that a program has three players from the same conference on one team. Source: Internet