"Pastor"- poimēn
1- one who herds sheep, shepherd, sheep-herder
2- one who serves as guardian or leader, shepherd
-BDAG-
"one who is responsible for the care and guidance of a Christian congregation"
-Louw-Nida-
The derivatives of this word involve lead, guide, protect, care for, and nuture.
"one who is called to the soul-care of God's people"
The Main Issue
"Apostles" = Authority and NT Canon
"Prophets" = Authority and Inerrancy
"Evangelists" = Authority and Ability
"Pastors" = Authority and Change