slacker vs shammer

slacker and shammer both are nouns.

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

As nouns, shammer is a hyponym of slacker; that is, shammer 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)
shammer: someone shirking their duty by feigning illness or incapacity

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

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