A homophone .
That is the correct spelling of "vital" (necessary, crucial).
The correct spelling is crucial (vitally important).
a crucial part in a story
The definition of the word pivotal is "of crucial importance in relation to the development or success of something else."
Imperative means to be of vital importance or crucial.
That is the correct spelling of "important" (having value, crucial, or essential).
Therapeutic communication is crucial to talk therapy. It is communication between a therapist and a client that helps build a positive relationship between them and heal the client.
crucial
crucial is an adverb. for example, crucial situation. it is no noun.
Crucial stage of a child is a stage of a child that is crucial
Californium is not crucial.
Evolution fits this definition, but the inclusion of the phrase, "with a common ancestor," is crucial in order to appropriately apply this term in the context of Darwin's work.