瞭 (w)

(liào) to watch from a height or distance; to survey

瞭哨 (w)

(liàoshào) to go on sentry duty; to stand guard

瞭望 (w)

(liàowàng) to watch from a height or distance; to keep a lookout

瞭望哨 (w)

(liàowàngshào) lookout post

瞭望台 (w)

(liàowàngtái) observation tower; lookout tower