Noun

• S: (n) freshman, fresher (a first-year undergraduate)
• S: (n) newcomer, fledgling, fledgeling, starter, neophyte, freshman, newbie, entrant (any new participant in some activity)

Adjective

• S: (adj) freshman, first-year (used of a person in the first year of an experience (especially in United States high school or college)) "a freshman senator"; "freshman year in high school or college"