blackwash vs hatchet job

blackwash and hatchet job both are nouns.

Word	Noun	Adjective	Verb	Adverb
blackwash	Yes	No	Yes	No
hatchet job	Yes	No	No	No

As nouns, hatchet job is a hypernym of blackwash; that is, hatchet job is a word with a broader meaning than blackwash:

blackwash: an attack intended to ruin someone's reputation
hatchet job: a false accusation of an offense or a malicious misrepresentation of someone's words or actions

Other hypernyms of blackwash include calumniation, calumny, defamation, obloquy, traducement.

blackwash (noun)	hatchet job (noun)
a wash that colors a surface black	a false accusation of an offense or a malicious misrepresentation of someone's words or actions
a mixture of calomel and limewater that is used on syphilitic sores
an attack intended to ruin someone's reputation

blackwash (verb)	hatchet job (verb)
color with blackwash
bring (information) out of concealment