across-the-board vs encompassing

across-the-board and encompassing both are adjectives.

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

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

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

across-the-board (adjective)	encompassing (adjective)
broad in scope or content	closely encircling
	broad in scope or content