swordsmanship vs skill

swordsmanship and skill both are nouns.

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

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

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

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