ambitious vs challenging

ambitious and challenging both are adjectives.

Word	Noun	Adjective	Verb	Adverb
ambitious	No	Yes	No	No
challenging	No	Yes	No	No

As adjectives, ambitious and challenging are synonyms defined as:

ambitious and challenging: requiring full use of your abilities or resources

ambitious (adjective)	challenging (adjective)
having a strong desire for success or achievement	requiring full use of your abilities or resources
requiring full use of your abilities or resources	disturbingly provocative
	stimulating interest or thought