From parash; a steed (as stretched out to a vehicle, not single nor for mounting (compare cuwc)); also (by implication) a driver (in a chariot), i.e. (collectively) cavalry -- horseman.
see HEBREW parash
see HEBREW cuwc
H6571. parash
II. [מָּרָשׁ] noun [masculine] horse, steed (less common synonym of סוּס ( > explained away by SchwZAW viii (1888). 191); Arabic horse, mare (often), so Ethiopic : compare Sabean פרס horse, MordtmHim. Inschr. 70); — Plural מָּרָשִׁים (erroneous for * מְּרָשִׁים Köii. 1, 89) Ezekiel 27:14 +, suffix מָּרָשָׁיו Isaiah 28:28; 1 Samuel 8:11; — steeds Ezekiel 27:14 ( + מְּרָדִים סוּסִים,), from Togarmah; simile of swiftness Joel 2:4 ("" סוּסִים); probably also Isaiah 28:28; Jeremiah 46:4 ("" סוּסִים, compare Gf Gie), and perhaps וגו וְרָצוּ וּבָעָרָשָׁיו בְּמֶרְכַבְחוֺ לוֺ ׳וְשָׂם 1 Samuel 8:11 (king subject).
II. מָּרָשׁ noun masculineNahum 3:3 horseman (i.e. * parrâš, compare Ges§ 84 b.b; Arabic ; Ethiopic : Aramaic מָּרָשׁ ); — absolute ׳פ 3:3; Jeremiah 4:29, also מָּרַשׁ Ezekiel 26:10 (as if construct KöSynt. § 337 s); Plural מָּרָשָׁים Genesis 50:9 +; suffix מָּרָשָׁיו Exodus 14:9 +; — horseman, usually plural, especially + רֶכֶב charioty: Egyptain Genesis 50:9 (J), Joshua 24:6 (E), Exodus 14:9; 14:17; 14:18; Exodus 17:23; 14:26, 28 (all P), 15:19 (song), Isaiah 31:1; 2 Kings 18:34 = Isaiah 36:9; 2 Chronicles 12:3; compare 16:8; Philistine 1 Samuel 13:5; 2 Samuel 1:6 (strike out ᵑ7 בַּעֲלֵי We Dr Bu HPS); Aramaean 10:18 (but read probably אִישׁ, compare "" 1 Chronicles 19:18, We Dr and others), and (+ רַגְלִי אִישׁ) 2 Samuel 8:4 = 1 Chronicles 18:4, compare 19:6; also וּפָרָשִׁים עַלסֿוּס 1 Kings 20:20 (si vera lectio) Israel, of Adonijah 1:5 (+ רָצִים אִישׁ חֲמִשִּׁים רֶכֶב; Solomon + רֶכֶב 9:19, 22; 10:26 2 Chronicles 8:6, 9; 1:14 (twice in verse), Prob also 1 Kings 5:6 ( + לְמֶרְכָּבוֺ סוּסִים) = 2 Chronicles 9:25 (+ וּמֶרְכָּכוֺת סוּסִים); Jehoahaz 2 Kings 13:7 (+ רַגְלִי); + רֶכֶב, figurative of Elijah 2:12, of Elisha 13:14; + סוּסִים Hosea 1:7; Assyrian Isaiah 22:6-7, (+ רֶכֶב), compare Nahum 3:3, ׳פ סוּסִים רִכְבֵי Ezekiel 23:6, 12 Babylonian Habakkuk 1:8 (twice in verse); Jeremiah 4:29 (+ קֶשֶׁת רֹמֵה), Ezekiel 26:7 (+ סוּס), רֶכֶב), 26:10 (+ וָרֶכֶב גַּלְגַּל), Scythian (Gog) 38:4 (+ סוּסִים); Persian Isaiah 21:7, 9 (פ ׳צֶמֶד), Nehemiah 2:9; Ezra 8:22; of kings of north Daniel 11:40 (+ רֶכֶב).