first; foremost; most important; best; greatest; above all
barrier; checkpoint; gateway; hurdle; obstacle; trial
clear; transparent; clearing (a high-jump bar, hurdle, etc.); overcoming; getting through; clearing (the ball; in soccer); clearing (e.g. a checked box)
stronghold; inner citadel; base; headquarters
robbery; pillage; seizure; hijacking; plunder; extortion
mission; delegation; mission (assignment); (religious) mission; mission school; transmission (in a motor vehicle)
from here; from this place
performance (as opposed to practice); going before an audience or on-air; game; match; high of the season; height (of summer, etc.)