donkeywork vs plodding

donkeywork and plodding both are nouns.

Word	Noun	Adjective	Verb	Adverb
donkeywork	Yes	No	No	No
plodding	Yes	Yes	No	No

As nouns, donkeywork and plodding are synonyms defined as:

Other synonyms of donkeywork include drudgery, grind.

donkeywork (noun)	plodding (noun)
hard monotonous routine work	hard monotonous routine work
	the act of walking with a slow heavy gait

donkeywork (adjective)	plodding (adjective)
	(of movement) slow and laborious