Crack

Pronunciation

 * The more Anglicised pronunciation is commoner in the drug sense (which entered the language more recently).
 * The more Anglicised pronunciation is commoner in the drug sense (which entered the language more recently).

Etymology 1
Late 19th century,.

Noun

 * 1)  pro, ace highly trained or skilled person
 * 2)  successful racehorse

Etymology 2
Late 20th century,.

Noun

 * 1) crack cocaine