workmanship vs skill

workmanship and skill both are nouns.

Word	Noun	Adjective	Verb	Adverb
workmanship	Yes	No	No	No
skill	Yes	No	No	No

As nouns, skill is a hypernym of workmanship; that is, skill is a word with a broader meaning than workmanship:

Other hypernyms of workmanship include accomplishment, acquirement, acquisition, attainment.

workmanship (noun)	skill (noun)
skill in an occupation or trade	ability to produce solutions in some problem domain
	an ability that has been acquired by training