expression:

• one's true nature; one's original face [literal] - Buddhism term

noun:

• ground; land; earth; soil - abbreviation
• the region in question; the local area
• skin
• texture; fabric; material; weave
• base; background
• one's true nature
• narrative (i.e. descriptive part of a story)
• real life; actuality
• captured territory (in the game of go)
• noh chorus ➜ 地謡
• accompaniment music (in Japanese dance)
• basic phrase (in Japanese music; usu. repetitive)
• base part (of multiple shamisens)

noun:

• root (of a plant)
• root (of a tooth, hair, etc.); center (of a pimple, etc.)
• root (of all evil, etc.); source; origin; cause; basis
• one's true nature
• (fishing) reef

expression / godan ~る verb:

• to conceal one's true nature or feelings; to feign friendliness; to play the hypocrite - idiom ➜ 猫をかぶる【ねこをかぶる】

expression / godan ~す verb:

• to reveal one's true nature - idiom

noun:

• skin; hide; pelt; fur ➜ 革
• rind; peel; husk; bark
• shell; sheath; wrapping
• mask (hiding one's true nature); seeming ➜ 化けの皮【ばけのかわ】・欲の皮が突っ張る【よくのかわがつっぱる】