deacon

As nouns the difference between apostle and deacon

is that apostle is a missionary, or leader of a religious mission, especially one in the early Christian Church (but see Apostle) while deacon is a designated minister of charity in the early Church (see Acts 6:1-6).

As a proper noun Apostle

is A rare transcription of the Greek male given name Απόστολος (usually transliterated as Apostolos).

As a verb deacon is

for a choir leader to lead a hymn by speaking one or two lines at a time, which are then sung by the choir.