macabre vs gruesome

macabre and gruesome both are adjectives.

Word	Noun	Adjective	Verb	Adverb
macabre	No	Yes	No	No
gruesome	No	Yes	No	No

As adjectives, macabre and gruesome are synonyms defined as:

Other synonyms of macabre include ghastly, grim, grisly, sick.

macabre (adjective)	gruesome (adjective)
shockingly repellent; inspiring horror	shockingly repellent; inspiring horror