oarsmanship vs attainment

oarsmanship and attainment both are nouns.

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

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

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

oarsmanship (noun)	attainment (noun)
skill as an oarsman	the act of achieving an aim
	arrival at a new stage
	an ability that has been acquired by training