subact /sub-aktˈ/

1. To work up (as in cultivation, the process of digestion, etc)
2. To subdue

subacˈtion /-shən/ noun

• letter-founders
• letter-gae
• letterhead
• letter-heading
• letterheads
• lettering
• letterings
• letterless
• letter missive
• lettern
• letter of attorney
• letter of comfort
• letter of credit
• letter of indication
• letter-of-marque
• letter of peace
• letter-perfect
• letterpress
• letterpresses
• letter quality
• letter-quality
• letters
• letters credential
• letterset
• lettersets