roc / rock are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
roc: (noun) mythical bird of prey having enormous size and strength.
rock: (noun) a lump or mass of hard consolidated mineral matter. (noun) material consisting of the aggregate of minerals like those making up the Earth's crust. (noun) United States gynecologist and devout Catholic who conducted the first clinical trials of the oral contraceptive pill (1890-1984). (noun) (figurative) someone who is strong and stable and dependable; ; --Gospel According to Matthew. (noun) pitching dangerously to one side. (verb) move back and forth or sideways. (verb) cause to move back and forth.
roc: r·AA·k
rock: r·AA·k
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)