This is the 2382nd most frequent Spanish word.
atlántico
"Atlántico" means "Atlantic," referring to anything related to the Atlantic Ocean.
In this sentence, 'Atlántico' is used as part of a proper noun—'Océano Atlántico'—referring specifically to the Atlantic Ocean.
El océano Atlántico es uno de los más grandes.
The Atlantic Ocean is one of the largest.
Here, 'atlántica' is an adjective derived from 'Atlántico,' describing a region associated with the Atlantic.
La región atlántica tiene un clima templado.
The Atlantic region has a mild climate.
In this example, 'Atlántico' is used as a standalone proper noun referring directly to the Atlantic Ocean.