crucial vs all important

crucial and all important both are adjectives.

Word	Noun	Adjective	Verb	Adverb
crucial	No	Yes	No	No
all important	No	Yes	No	No

As adjectives, crucial and all important are synonyms defined as:

Other synonyms of crucial include all-important, essential, of the essence.

crucial (adjective)	all important (adjective)
of extreme importance; vital to the resolution of a crisis	of the greatest importance
of the greatest importance
having crucial relevance