1: ἀπόστολος
(Strong's #652 — Noun Masculine — apostolos — ap-os'-tol-os )

is, lit., "one sent forth" (apo, "from," stello, "to send"). "The word is used of the Lord Jesus to describe His relation to God, Hebrews 3:1; see John 17:3 . The twelve disciples chosen by the Lord for special training were so called, Luke 6:13; 9:10 . Paul, though he had seen the Lord Jesus, 1—Corinthians 9:1; 15:8 , had not 'companied with' the Twelve 'all the time' of His earthly ministry, and hence was not eligible for a place among them, according to Peter's description of the necessary qualifications, Acts 1:22 . Paul was commissioned directly, by the Lord Himself, after His Ascension, to carry the Gospel to the Gentiles.

Acts 14:4,14Romans 16:7 2—Corinthians 8:23 Philippians 2:25 1—Thessalonians 2:6
2: ἀποστολή
(Strong's #651 — Noun Feminine — apostole — ap-os-tol-ay' )

"a sending, a mission," signifies an apostleship, Acts 1:25; Romans 1:5; 1—Corinthians 9:2; Galatians 2:8 .

2—Corinthians 11:13