codswallop vs hackwork

codswallop and hackwork both are nouns.

Word	Noun	Adjective	Verb	Adverb
codswallop	Yes	No	No	No
hackwork	Yes	No	No	No

As nouns, hackwork is a hyponym of codswallop; that is, hackwork is a word with a more specific, narrower meaning than codswallop:

codswallop: nonsensical talk or writing
hackwork: (Literary & Literary Critical Terms) undistinguished literary work produced to order.

codswallop (noun)	hackwork (noun)
nonsensical talk or writing	professional work done according to formula
	(Literary & Literary Critical Terms) undistinguished literary work produced to order.