Translation guide
The English word 'junior' can refer to a younger person, someone of lower rank, or a student in their third year of high school or college. This guide covers natural Japanese expressions for each meaning.
Referring to someone younger than oneself, often in school, family, or social contexts.
Refers to a junior in school, club, or workplace. Implies a hierarchical relationship where the junior is expected to show respect.
He is my junior (at school/work).
Teach a junior how to do the work.
Simply means 'younger' in age. Can be used for anyone younger, not necessarily in a hierarchical relationship.
He is younger than me.
A person who is younger. More neutral than 後輩.
I'm not good at talking to people younger than me.
Someone with less experience, lower position, or subordinate role in an organization.
A subordinate in a workplace. Implies a direct reporting relationship.
He is my subordinate.
Can also be used in workplace contexts for someone who joined after you, regardless of age.
A person of lower status or younger age. Formal and somewhat old-fashioned.
Specifically referring to a student in their third year of high school or college in the US system.
Used after a name to indicate a son with the same name as the father.
Japanese does not have a direct equivalent. You can say '〜ジュニア' as a loanword or explain '父と同名の息子' (son with the same name as the father).
He is John Smith Jr.
He has the same name as his father and is called Junior.
The loanword ジュニア is not used for school years in Japanese. Use 3年生 instead.
後輩 implies a hierarchical relationship (senior-junior) often in school or work. 年下 simply means younger in age and can be used for anyone.
後輩の面倒を見る。
Look after one's juniors.
Treat even those of lower status politely.
I studied abroad when I was a junior in college.
He is a junior (third-year student).