seamanship vs attainment

seamanship and attainment both are nouns.

Word	Noun	Adjective	Verb	Adverb
seamanship	Yes	No	No	No
attainment	Yes	No	No	No

As nouns, attainment is a hypernym of seamanship; that is, attainment is a word with a broader meaning than seamanship:

Other hypernyms of seamanship include accomplishment, acquirement, acquisition, skill.

seamanship (noun)	attainment (noun)
skill in sailing	the act of achieving an aim
	arrival at a new stage
	an ability that has been acquired by training