• 兼業けんぎょう — side job, holding another job
• 兼任けんにん — concurrent post
• 兼職けんしょく — multiple jobs
• 兼用けんよう — dual-use, shared use
• 兼かねる — to combine, to be unable to do

The kanji 兼 depicts two bundles of rice (禾) being joined together by hand (又), symbolizing the idea of combining or doing more than one thing simultaneously. It’s often used in professional or administrative contexts.

彼かれは 教師きょうしと作家さっかを 兼かねている。
He works both as a teacher and a writer.

この部屋へやは 会議室かいぎしつと休憩室きゅうけいしつを 兼用けんようしている。
This room is used both as a meeting room and a lounge.

On-yomi ケン is used in most compound words, while the kun-yomi かねる is used in verbs. Note that かねる also appears in expressions like ご遠慮願ねがい兼かねます (We regret we cannot...).