Old Norse Wordlist A-Z
These are rough and simple translations. If you want better understanding of a certain word, Google it. Some words are not used in game, but are simply listed to make this a good compilation of 'old Norse wartime words'.
*The letter ǫ has been omitted from all words in game (and replaced with the letter o) since it's simply not supported.

Old Norse:
Arinvǫrðr - Hearthguard (Arinn = hearth, vǫrðr = guard). Made up compound word.
Banamaðr - Slayer, killer, executioner
Berserkr - Berserker (Bear-Shirt)
Bogsveigir - Archer (bow-swayer)
Bóndi - Farmer, Freeman
Drengr - Young bold gallant man
Einheri - Einherjar
Einhleyping - Icelandic housecarl (lone-runner)
Forungi - captain, commander, officer
Fylkir - chief, peoples' leader
Gaflakskyti - Javelineer (Gaflak = javelin. Skyti = shooter)
Gestr - Mercenary (Guest)
Griðmenn - Norwegian housecarls (Home-men)
Goði - Norse pagan religious leader
Lausamenn - Icelandic housecarls (untied men)
Leiðangr - Levy, Lething, coast guard
Lendrmaðr - Man with the highest rank in the Hird.
Logmaðr - Law Speaker (Lawman)
Farmaðr - Seafarer, Wayfarer
Harjar - Warrior, raider
Heimþegi - Danish housecarl (home-receiver)
Heiðþegi - Norwegian housecarl (gift-reciever)
Hergaupa - War-lynx (poetic term for wolf)
Hermaðr - Warrior, Soldier
Hersir - Warlord, raid leader
Hilmir - King, prince, leader (poetic expression. Literal translation is helmet or helmsman)
Hirðmaðr - Man of the 'Hird', retainer
Holumaðr - Longship crewman
Hreystimaðr - Champion (courageous man)
Húskarl - Housecarl, retainer (house man)
Innæsmæn - Danish housecarls (Inside-men)
Jarl - A noble title
Kappi - Warrior, champion
Karl - Freeman
Kertilsveinn - Squire (Candle-man)
Leysingi - Freed thrall
Merkismaðr - Standard bearer
Níðingr - Villain
Óðalmaðr - Firstborn farmer, man with inheritance rights
Ráðning - Warband leader (?)
Rekkr - Warrior
Riddari - Rider, Knight
Sigrmær - Victory Maiden (Alternative word for valkyrie)
Skáld - Bard, Poet
Skelmir - Trickster
Skipsvrekr - Made up compound-word for ship wrecking.
Skjaldmær - Shieldmaiden
Skógarbóndi - Forest farmer
Skógarmaðr - Forest man, outlaw
Skógarvǫrðr - Forest guard
Skǫrungr - Champion, outstanding person
Skrælingi - Vinland / Greenland Native
Skutilsveinn - Knight (table-man)
Spejari - Scout, spy
Stallari - Marshal
Stórmaðr - Man of rank
Stórmeistari - Grandmaster
Styrimaðr - Ship Captain, Helmsman
Svanni - Swan (poetic term for lady)
Sækonungr - Powerful viking chieftain (Sea-King)
Úlfhéðinn - Wolf-Coat
Útlagi - Outlaw
Útsendari - Scout, Emissary
Valkyrja - Valkyrie
Veiðimaðr - Hunter
Verðung - King's man (poetic)
Vígmaðr - Warrior, Combatant
Vikingr - Viking, Raider
Væringi - Varangian
Vǫlva - Seeresa
Vǫrðr - Guard, Warden
Ýskelfir - Shaker of the yew bow (poetic expression)
Þegn - Thane, many split meanings.
Þengill - King, prince (poetic)
Þingmaðr - Thingman (Kind of Norse congressman)
Þræll - Thrall

Anglo-Saxon / old English:
Beahgifa - Lord, king (ring-giver)
Fyrd - Levy
Gesith - Companion
Heorðwerod - Hearth troop
Hearthweru - Hearthguard
Lithsmen - Housecarls

Slavic:
Bogatyr - Hero, knight
Luchnik - Archer
Ratnik - Warrior