skulker vs shammer

skulker and shammer both are nouns.

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

As nouns, skulker and shammer are synonyms defined as:

skulker and shammer: someone shirking their duty by feigning illness or incapacity

Other synonyms of skulker include malingerer.

skulker (noun)	shammer (noun)
someone waiting in concealment	a person who makes deceitful pretenses
someone shirking their duty by feigning illness or incapacity	someone shirking their duty by feigning illness or incapacity