• 根ね — root
• 根本こんぽん — foundation / basis
• 屋根やね — roof
• 根気こんき — patience / perseverance
• 根性こんじょう — guts / determination
• 根元ねもと — base / origin / root
• 根拠こんきょ — basis / grounds

The kanji 根 combines the radical 木き (tree) with 艮こん (stopping, staying still). It represents the part of the tree that stays in the ground — the root — and metaphorically suggests foundations or sources of things.