Etymology
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Words related to buy

bought 
past tense and past participle of buy (v.).
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boughten (adj.)

irregular past participle of buy, used as an adjective from 1793, especially in colloquial U.S. usage, of clothing and other items, opposed to "made."

BOUGHTEN. Which is bought. This is a common word in the interior of New England and New York. It is applied to articles purchased from the shops, to distinguish them from similar articles of home manufacture. [Bartlett, "Dictionary of Americanisms," 1848]
buyer (n.)
c. 1200, biggere "one who purchases," agent noun from buy (v.). Meaning "one whose job is to buy goods for a store" is from 1884. Buyer's market attested from 1886.
buy-in (n.)
"act of obtaining an interest in," 1970, from verbal phrase buy in "to purchase a commission or stock" (1826), from buy (v.) + in (adv.). To buy into "obtain an interest in by purchase" (as of stock shares) is recorded from 1680s.
buy-out (n.)
also buy-out, "the purchasing of a controlling share in a company," 1961, from verbal phrase buy out "purchase (someone's) estate and turn him out of it," 1640s, from buy (v.) + out (adv.).