Quenya 

-mo

suffix. agental suffix
Quenya [MR/049; WJ/400] Group: Eldamo. Published by

-mo

-mo

-mo ending frequent in names and titles, sometimes with an agental significance (WJ:400)

osto

noun. fortress, stronghold, strong place, *[ᴹQ.] city, *town with wall round
Quenya [MR/350; MR/471; SA/os(t); VT39/06; WJ/414] Group: Eldamo. Published by

* -r(o)

suffix. agental suffix
Quenya [PE18/100; VT41/13; WJ/371] Group: Eldamo. Published by