幹 - tree trunk, main part, talent

executive secretary; coordinator; organizer; person in charge of making arrangements

main line; trunk line

Shinkansen; bullet train

management; (executive) staff; leaders; leadership; top brass; upper echelons

foundation; root; basis; core; fundamentals

chief editor; managing editor

tree trunk; bole

mainstay; nucleus; key

leader line

stem (word)

senior chief engineer

embryonic stem cell; ES