1. Originating by abiogenesis

See also: abiogenesis

• Lethe
• Lethean
• lethologica
• Leto
• Lett
• letter
• letter bomb
• letter bond
• letter box
• letter carrier
• letter case
• letter of credit
• letter of intent
• Letter of Jeremiah
• letter of mark and reprisal
• letter of marque
• letter of the alphabet
• letter opener
• letter paper
• letter security
• letter stock
• letter telegram
• letter writer
• letter-perfect
• lettercard