slacker vs malingerer

slacker and malingerer both are nouns.

Word	Noun	Adjective	Verb	Adverb
slacker	Yes	No	No	No
malingerer	Yes	No	No	No

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

slacker: a person who shirks his work or duty (especially one who tries to evade military service in wartime)
malingerer: someone shirking their duty by feigning illness or incapacity

Other hyponyms of slacker include goldbrick, shammer, skulker, scrimshanker.

slacker (noun)	malingerer (noun)
a person who shirks his work or duty (especially one who tries to evade military service in wartime)	someone shirking their duty by feigning illness or incapacity