専門
せんもん · senmon · JLPT N4 · noun
speciality
🎓 専門 = exclusive + gate: the one gate you enter, your speciality
専 means exclusive or solely; 門 means gate, and by extension a school or field of study. A field you devote yourself to solely is your major. Sound hook: senmon is the same sen-mon as in 専門家, a specialist.