Realizar vs. concretizar
While both realizar and concretizar allow you to say you are bringing something into existence, they differ slightly in focus. Realizar is a broad term for accomplishing tasks, dreams, or events, essentially making them happen. Concretizar is more specific; it highlights the process of turning an abstract idea or a vague plan into something solid, tangible, and concrete.
Realizar
B1This verb is widely used to express carrying out a plan, achieving a life goal, or holding an event. It focuses on the action of doing or the sense of accomplishment. It is also used reflexively (realizar-se) to describe personal fulfillment.
Ela trabalhou muito para realizar o seu sonho de ser médica.
(She worked hard to realize her dream of being a doctor.)
A empresa vai realizar uma reunião importante amanhã.
(The company will hold an important meeting tomorrow.)
Ele sente-se feliz por realizar todas as tarefas da lista.
(He feels happy for accomplishing all the tasks on the list.)
Tu precisas de mudar de emprego para te realizares profissionalmente.
(You need to change jobs to fulfill yourself professionally.)
Concretizar
B2This verb focuses on materialization. It describes taking something that only exists in the mind (an idea, a theory, a wish) and giving it a physical or definitive form. It is often used for finalizing deals or putting vague projects into actual practice.
Foi difícil concretizar aquela ideia abstrata num produto real.
(It was difficult to materialize that abstract idea into a real product.)
Depois de meses de negociação, conseguimos concretizar a venda da casa.
(After months of negotiation, we managed to finalize the sale of the house.)
O governo prometeu muito, mas não conseguiu concretizar as medidas.
(The government promised a lot, but could not put the measures into practice.)
Precisamos de investimento para concretizar este projeto.
(We need investment to bring this project to reality.)
Summary
Use realizar as your go-to word for general achievements, fulfilling emotional dreams, or holding events. Use concretizar when you want to emphasize the specific act of solidifying a deal or turning a thought into a tangible object.