stimulating vs challenging

stimulating and challenging both are adjectives.

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

stimulating (adjective)	challenging (adjective)
rousing or quickening activity or the senses	requiring full use of your abilities or resources
making lively and cheerful	disturbingly provocative
that stimulates	stimulating interest or thought