The Quenya words for far (remote) are haira, eccaira, and avahaira. Words for far away are vahaia and háya (also haiya). The prefix palen- means far, distant, wide, to a great extent, over a wide space, to a distance.
The Sindarin words for far (remote, distant) are hae and haeron. The prefix palen- means afar, abroad, far and wide.