malingering vs skulking

malingering and skulking both are nouns.

Word	Noun	Adjective	Verb	Adverb
malingering	Yes	No	No	No
skulking	Yes	No	No	No

As nouns, malingering and skulking are synonyms defined as:

malingering and skulking: evading duty or work by pretending to be incapacitated

malingering (noun)	skulking (noun)
evading duty or work by pretending to be incapacitated	evading duty or work by pretending to be incapacitated