• 納税のうぜい — tax payment
• 納品のうひん — delivery of goods
• 納豆なっとう — fermented soybeans
• 収納しゅうのう — storage
• 納得なっとく — understanding; consent
• 出納すいとう — receipts and payments; cash handling
• 納所なっしょ — receiving office (historical)

納 combines 糸 (thread) with 内 (inside), evoking enclosing or putting something in. It broadened to receiving, storing, paying, settling, or bringing to completion.

Common across payment, storage, and acceptance terms—both concrete and abstract (e.g., 納得 “to be convinced”).

税金ぜいきんを 納おさめました。
I paid the taxes.

この商品しょうひんは 来週らいしゅう納品のうひんされます。
This product will be delivered next week.