Definition of beacon:

a radio station that broadcasts a directional signal for navigational purposes

Synonyms of beacon:

radio beacon, lighthouse, signal, light, flare, lamp, pharos, guide, buoy

Opposite/Antonyms of beacon:

dim, black, stator, disadvantage, deficit, fuse, saddle, lodge

Sentence/Example of beacon:

The light flared like a beacon in the universe, bright enough for all to see.