Quick definitions from WordNet (rock)

▸ noun:  pitching dangerously to one side
▸ noun:  a lump or mass of hard consolidated mineral matter ("He threw a rock at me")
▸ noun:  (figurative) someone who is strong and stable and dependable ("He was her rock during the crisis")
▸ noun:  United States gynecologist and devout Catholic who conducted the first clinical trials of the oral contraceptive pill (1890-1984)
▸ noun:  material consisting of the aggregate of minerals like those making up the Earth's crust ("That mountain is solid rock")
▸ noun:  hard stick bright-colored stick candy typically peppermint flavored
▸ noun:  a genre of popular music originating in the 1950s; a blend of Black rhythm-and-blues with White country-and-western ("Rock is a generic term for the range of styles that evolved out of rock'n'roll.")
▸ verb:  move back and forth or sideways ("The ship was rocking")
▸ verb:  cause to move back and forth ("Rock the cradle")
▸ name:  A surname (common: 1 in 12500 families; popularity rank in the U.S.: #1662)

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▸ Also see rock