marksmanship vs skill

marksmanship and skill both are nouns.

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

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

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

marksmanship (noun)	skill (noun)
skill in shooting	ability to produce solutions in some problem domain
	an ability that has been acquired by training