challenging vs hard

challenging and hard both are adjectives.

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

challenging (adjective)	hard (adjective)
requiring full use of your abilities or resources	produced without vibration of the vocal cords
disturbingly provocative	resisting weight or pressure
stimulating interest or thought	dispassionate
	(of speech sounds); produced with the back of the tongue raised toward or touching the velum
	(of light) transmitted directly from a pointed light source
	not easy; requiring great physical or mental effort to accomplish or comprehend or endure
	being distilled rather than fermented; having a high alcoholic content
	unfortunate or hard to bear
	given to excessive indulgence of bodily appetites especially for intoxicating liquors
	dried out
	very strong or vigorous
	characterized by effort to the point of exhaustion; especially physical effort

challenging (adverb)	hard (adverb)
	with effort or force or vigor
	to the full extent possible; all the way
	slowly and with difficulty
	causing great damage or hardship
	with firmness
	indulging excessively
	earnestly or intently
	with pain or distress or bitterness
	very near or close in space or time
	into a solid condition