maiden

a young, unmarried woman

seraph

a high-ranking angel

covet

to be jealous; to want something that doesn't belong to you

highborn

from a noble, aristocratic family

kinsman

a blood relative

bore

past tense of "bear" (to carry)

sepulcher

a small building, made of stone, in which a dead person is buried.

envy

jealousy; to be jealous of

dissever

to separate

beam

to shine a ray of light, like a moonbeam

night-tide

night-time

tomb

a burial chamber; an enclosed space for a dead body

sounding

producing a sound

sounding sea = the sea that is making a sound