Questions on Adunaic and Quenya

Hello all, I've got some really burning questions. Unfortunately I'm not a linguist so I'm finding it difficult to make sense of some of my readings on Numenor. Any help would be greatly appreciated.

Quenya

In the word Herunumen (as in Tar-Herunumen) is the word using the genitive case ? Does anyone know if the word translates as 'west belonging to the lord' or 'lord belonging to the west '?

Adunaic

Is the name 'Adunakhor' a singular or plural, or possesive ?

Could somebody please translate the following into Quenya and then the tengwar for me:

'To West Lay All Dread'

Thanks
monks

ps Happy New Year!