Horsemen
From BiblePortal Wikipedia
Vine's Expository Dictionary of NT Words [1]
1: Ἱππεύς (Strong'S #2460 — Noun Masculine — hippeus — hip-yooce' )
"a horseman," is used in the plural in Acts 23:23,32 .
2: Ἱππικός (Strong'S #2461 — Adjective — hippikos — hip-pee-kon' )
an adjective signifying "of a horse" or "of horsemen, equestrian," is used as a noun denoting "cavalry," in Revelation 9:16 , "horsemen," numbering "twice ten thousand times ten thousand," RV.
Webster's Dictionary [2]
(pl.) of Horseman