Nounenvelope

Nounseal

Noun, Suru verb, Transitive verbopening (a letter, parcel, etc.); breaking the seal · unboxing (a product) · unsealed mail

Noun, Suru verb, Transitive verbtotal blockage; complete shutdown; stopping completely · shutout

Noun, Suru verb, Transitive verb, Noun which may take the genitive case particle 'no'enclosing (e.g. with a letter)