attainment vs skill

attainment and skill both are nouns.

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

As nouns, attainment and skill are synonyms defined as:

Other synonyms of attainment include accomplishment, acquirement, acquisition.

attainment (noun)	skill (noun)
the act of achieving an aim	ability to produce solutions in some problem domain
arrival at a new stage	an ability that has been acquired by training
an ability that has been acquired by training