How are the verbs «نُورِدُ» and «نُصْدِرُ» related?

ʿAmr ibn Kulthūm: Address to Abā Hind, Tribal Pride and the Mill of War (Verses 23–38)

• Both mean sleeping and waking
• Both refer only to writing
• One is an adjective and the other an adverb
• Taking to water and bringing back, transferred to battle