diddly-shit vs shit

diddly-shit and shit both are nouns.

Word	Noun	Adjective	Verb	Adverb
diddly-shit	Yes	No	No	No
shit	Yes	No	Yes	No

As nouns, diddly-shit and shit are synonyms defined as:

Other synonyms of diddly-shit include diddley, diddly-squat, diddly, diddlyshit, diddlysquat, doodly-squat, jack, squat.

diddly-shit (noun)	shit (noun)
a small worthless amount	something of little value
	Obscene word for unacceptable behavior
	insulting terms of address for people who are stupid or irritating or ridiculous
	a coarse term for defecation
	a small worthless amount
	obscene terms for feces

diddly-shit (verb)	shit (verb)
	have a bowel movement
	give away information about somebody