#長 is a character and it makes its own radical although characters with that radical are not part of the Japanese language. According to my dictionary, it is a pictograph depicting an old man with long hair walking with a walking stick (I can’t picture that myself but …) and from there it developed the meaning of “long.”
長子（チョウシ）: the eldest child
長女（チョウジョ）: the oldest daughter
長男（チョウナン）: the oldest son
長所（チョウショ）: a strong point, one’s forte
社長（シャチョウ）: the president (of a company)
延長（エンチョウ）: extension
長（なが）い: long
長靴（ながぐつ）: high boots
<Difficult Readings>
村（むら）の長（おさ）: a village chief
～に長（た）ける: become skilled at ～
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