n.; pl.Lighthouses A tower or other building with a powerful light at top, erected at the entrance of a port, or at some important point on a coast, to serve as a guide to mariners at night; a pharos. [ 1913 Webster ]
[とうだい, toudai] (n) (1) lighthouse; (2) old-fashioned interior light fixture comprising a wooden pole with an oil-filled dish and a wick atop it; (P)#6858
[こうきょうざい, koukyouzai] (n) (See 集合財) public goods (i.e. goods or services such as lighthouses, military installations, etc., which are provided by government)