attain vs breast

attain is not a noun while breast is a noun.

Word	Noun	Adjective	Verb	Adverb
attain	No	No	Yes	No
breast	Yes	No	Yes	No

As verbs, breast is a hyponym of attain; that is, breast is a word with a more specific, narrower meaning than attain:

attain (noun)	breast (noun)
	the part of an animal's body that corresponds to a person's chest
	either of two soft fleshy milk-secreting glandular organs on the chest of a woman
	the front of the trunk from the neck to the abdomen
	meat carved from the breast of a fowl

attain (verb)	breast (verb)
reach a point in time, or a certain state or level	confront bodily
reach a destination, either real or abstract	reach the summit (of a mountain)
find unexpectedly	meet at breast level
to gain with effort