goofing off vs shirking

goofing off and shirking both are nouns.

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

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

Other synonyms of goofing off include goldbricking, slacking, soldiering.

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