• 糹(silk thread; filament)
• 巠(underground water vein running straight)

Silk threads running straight down in rows on a loom frame form the warp threads.

• 艹(grass; plant)
• 洛(Luo River (sound and meaning of falling into water))

Leaves falling from a tree like water flowing in a river expresses the meaning of the character for falling.

• 口(mouth; door)
• 后(behind; empress (figuratively—one who rules from behind))

A mouth giving orders from behind the golden throne is the authority of an empress.

• 糹(silk thread; filament)
• 巠(underground water vein running straight)

Silk threads running straight down in rows on a loom frame form the warp threads.

• 艹(grass; plant)
• 洛(Luo River (sound and meaning of falling into water))

Leaves falling from a tree like water flowing in a river expresses the meaning of the character for falling.

• 口(mouth; door)
• 后(behind; empress (figuratively—one who rules from behind))

A mouth giving orders from behind the golden throne is the authority of an empress.