across-the-board vs wide

across-the-board and wide both are adjectives.

Word	Noun	Adjective	Verb	Adverb
across-the-board	No	Yes	No	No
wide	No	Yes	No	Yes

As adjectives, across-the-board and wide are synonyms defined as:

Other synonyms of across-the-board include all-embracing, all-encompassing, all-inclusive, blanket, broad, encompassing, extensive, panoptic.

across-the-board (adjective)	wide (adjective)
broad in scope or content	having great (or a certain) extent from one side to the other
	great in degree
	having ample fabric
	broad in scope or content
	not on target
	very large in expanse or scope
	(used of eyes) fully open or extended

across-the-board (adverb)	wide (adverb)
	to or over a great extent or range; far
	with or by a broad space
	far from the intended target
	to the fullest extent possible