1: ἅρμα
(Strong's #716 — Noun Neuter — harma — har'-mah )

akin to ararisko, "to join," denotes "a war chariot with two wheels," Acts 8:28,29,38; Revelation 9:9 .

2: ῥέδη
(Strong's #4480 — Noun Feminine — rhede — hred'-ah )

"a wagon with four wheels," was chiefly used for traveling purposes, Revelation 18:13 .