From Longman Dictionary of Contemporary Englishlighthouselight‧house /ˈlaɪthaʊs/ noun [countable] 
TTWa tower with a powerful flashing light that guides ships away from danger
TTWa tower with a powerful flashing light that guides ships away from dangerExamples from the Corpus
lighthouse• On one of them, Longstone Island, there is a lighthouse.• Like a lighthouse beacon, this magnetic field has guided ocean voyagers for hundreds of years.• This central tower represents a lighthouse, Holmes.• Such monuments, verbal and physical, are lighthouses for our psyche, navigational aids for our talking and thinking.• She had seen, like a distant lighthouse, headlamps moving round the castle on the skyline.• Every Christmas now he hires that little plane and drops all those boxes of gifts to the lighthouse keepers.• We found the eider flock at the back of Bound Skerry, on which the lighthouse stands. 