No. Though both words indicate the importance of the (task, mission, etc.), and imply dire consequences associated with failure, "urgent" has a time component as well. "Crucial" means it has to be done. "Urgent" means it has to be done soon.
Urgent and crucial are not antonyms, they are synonyms. They basically mean the same thing. Other synonyms for crucial and urgent are vital, compelling, desperate, and high-priority.
There are several appropriate synonyms for the word climatic. They include: crucial, acute, central, decisive, dire, urgent, vital, imperative, and necessary.
The word important can have the synonyms crucial, vital, valuable, significant, or substantial.
decisive, critical, deciding, determining
Synonyms: PolarSimilar Terms: Crucial, Important
acute, crucial, key, significant
Some synonyms for pivotal are: Crucial Middle Essential Focal Vital central cardinal axial critical principal
The adjective immediate can mean current or instantaneous, and imply a necessary action. It could have the synonyms pressing, urgent, paramount, or critical. When an action is about to happen, immediate can have the synonyms imminent, impending, or oncoming. Immediate can also mean close-at-hand, with the synonyms adjacent, nearby, or proximate.
crucial, significant, critical, influential, momentous, conclusive, fateful
vital, important, necessary, critical, crucial, key, indispensable
Some synonyms for Vital are-Essential,Necessary,Crucial, etc.
more urgent, most urgent