朽 ⇒
腐朽 fǔxiǔ, rotten/decayed/decadent/degenerate
不朽 bùxiǔ, immortal/immortality
朽 xiǔ, rotten
永垂不朽 yǒngchuíbùxiǔ, eternal glory/will never be forgotten
朽木 xiǔmù, rotten wood
老朽 朽烂 xiǔlàn, [朽爛], rotten
摧枯拉朽
蠹 ⇒
蠹 dù, insect that eats into books, clothing etc/moth-eaten/worm-eaten
蠹虫 dùchóng, [蠹蟲], moth/harmful person/vermin