sackcloth and ashes vs display

sackcloth and ashes and display both are nouns.

Word	Noun	Adjective	Verb	Adverb
sackcloth and ashes	Yes	No	No	No
display	Yes	No	Yes	No

As nouns, display is a hypernym of sackcloth and ashes; that is, display is a word with a broader meaning than sackcloth and ashes:

sackcloth and ashes (noun)	display (noun)
a display of extreme remorse or repentance or grief	something shown to the public
	a visual representation of something
	an electronic device that represents information in visual form
	exhibiting openly in public view
	something intended to communicate a particular impression
	behavior that makes your feelings public

sackcloth and ashes (verb)	display (verb)
	to show, make visible or apparent
	attract attention by displaying some body part or posing; of animals