The word "worlds" refers to different units or spheres of existence within our vast universe. Some synonyms for this term include realms, domains, territories, and universes. Each of these words brings its own unique connotation to the table. For example, "realms" may imply a specific boundary or limit, while "domains" suggests a level of authority or control. "Territories" can insinuate a sense of ownership or territory. And "universes" may evoke a sense of vastness, possibility, or complexity. No matter which synonym you choose to use, they all point to the diversity and richness of our world- both literally and metaphorically.