Root

元

moto

(primary source)

根

ne

(part of a plant)

根

kon

(arithmetic: number or expression which when raised to a power gives the specified number or expression)

根源

kongen

(primary source)

歯根

shikon

(of a tooth)

解

kai

(analysis: zero of a function)

語根

gokon

(linguistic morphology: primary lexical unit of a word)

起源

kigen

(primary source)