This is the 4328th most frequent Japanese word.
副業
Side job or secondary business.
Here, 副業 is used to mean a side job or secondary occupation in addition to one's main job or profession.
副業で写真撮影をしています。
I work as a photographer as a side job.
In this sentence, 副業 indicates a secondary engagement or business one undertakes alongside their regular work.
彼は副業として家事代行を始めました。
He started a housekeeping service as a side business.
Here, 副業 emphasizes balancing a secondary work activity while being a student, highlighting the challenge of time management.