registered mail

noun 0.817

airmail

noun 0.633

mail cover

noun 0.617

surface mail

noun 0.604

parcel post

noun 0.603

mail truck

noun 0.594

special delivery

noun 0.586

mail

noun 0.583

certifiable

noun 0.578

snail mail

noun 0.578

postal money order

noun 0.573

postmark

noun 0.566

mail train

noun 0.565

certificate

noun 0.561

certification

noun 0.560

postage meter

noun 0.559

digital certificate

noun 0.552

mailpiece

noun 0.549

postage

noun 0.546

electronic mail

noun 0.546

money order

noun 0.532

postal order

noun 0.531

courier

noun 0.528

postal history

noun 0.527

letter carrier

noun 0.525

padded envelope

noun 0.525

postal address

noun 0.525

mailer

noun 0.523

mail slot

noun 0.522

certified accountant

noun 0.521

mail stop

noun 0.518

maile

noun 0.517

mailroom

noun 0.516

mail order

noun 0.513

postcard

noun 0.510

mail relay

noun 0.509

mailboat

noun 0.507

air parcel

noun 0.502

general delivery

noun 0.500