letter, n. initial (first letter).
letter-carrier, n. postman, [mail-carrier], [courier], mail-man, postboy, [post].
letter for letter. literatim.
letters, n. pl. [correspondence].
letters, n. pl. [learning], literature, [erudition], humanities.
let-up, n. (Colloq.) [abatement], assuagement, respite, [subsidence].
let up. (Colloq.) [abate], [subside], [diminish], intermit.
level, a. [even], [flat], [plain], [smooth], [flush], [plumb]; horizontal; [steady], [impartial], well-balanced. Antonyms: undulating [uneven], [concave], [convex], [warped].
level, v. flatten, equalize, [even], [smooth], [reduce]; [raze], [reduce], [overthrow], [demolish]; [adapt], adjust.
lever, n. [pry]. Associated words: fulcrum, [purchase], [prize], prizing.