shirking vs goofing off

shirking and goofing off both are nouns.

Word	Noun	Adjective	Verb	Adverb
shirking	Yes	No	No	No
goofing off	Yes	No	No	No

As nouns, shirking and goofing off are synonyms defined as:

Other synonyms of shirking include goldbricking, slacking, soldiering.

shirking (noun)	goofing off (noun)
the evasion of work or duty	the evasion of work or duty