dēaþ-scūa, m.n: shadow of death, death. (DAY-ath-SHOO-ah / ˈdeːaθ-ˌʃuːa)

dēaþ-scūa, m.n: shadow of death, death. (DAY-ath-SHOO-ah / ˈdeːaθ-ˌʃuːa)

un-mann, m.n: bad person, inhuman person; hero, one who is more than an average person. (UN-MAHN / ˈʌn-ˌman)
aglǣcwīf, n.n: hostile female fighter, fierce female combatant. (AH-GLACK-weef / ˈa-ˌglæːk-wiːf)
āglǣca, m.n: hostile fighter, fierce combatant, great opponent. (AH-GLACK-ah / ˈa-ˌglæː-ka)
There aren’t any good word-for-word translations. Often translators use ‘monster’ but there is no word in Old English that means simply ‘monster’, and āglǣca can refer to (human) heroes as well as monsters. Grendel is an āglǣca but so is Beowulf.
grund-wyrgen, f.n: wolf of the deep. (GRUND-WUER-yen / ˈgrʌnd-ˌwyr-jɛn)
Grendel’s mother is described as a grund-wyrgen.

scucca, m.n: devil, demon; Satan. (SHUCK-ah / ˈʃʌ-ka)
hell-rūne, f.n: demon, one who knows hell’s mysteries. (HELL-ROON-uh / ˈhɛl-ˌruː-nə)
winter-fylleþ, m.n: October. (WIN-ter-FUELL-eth / ˈwɪn-tɛr–ˌfyl-lɛθ)
wēod, n.n: useless or injurious plant, weed. (WAY-odd / ˈweːɔd)