(1) zero g roll is basically a roll at the apex of a airtime hill like the 3rd inversion of Scream, zero g stall pauses in roll upside down like twisted or west coast racers.
(2) high- banked turn is just that a turn with alot of bank up to 90 degess, an overbank is a turn where the bank exceeds 90 degress.
(3)near misses, again just like it sounds, ya know, head choppers, weaving close to structures or two trains over and under each other
(4) track crossovers? You're really typing your own answers here....when the tracks cross over (or under) each other, typically referred to on a racing or dueling coaster...
That help?