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