Phenyl is the name given to a benzene ring when it is attached to a molecule.
The chemical formula for this is C14H14O.
The phenyl ring is the hexagon with the circle inside it. Each vertex of the hexagon is a carbon atom. It is to be understood that there is a hydrogen atom bonded to each carbon in the ring except the one which connects it to the rest of the molecule.
Ethanol is C2H6O, 2 carbon atoms, 6 hydrogens, one oxygen. To expand another way to express the formula is CH3CH2OH, which gives some information about where the atoms are arranged in the molecule.
A ball and stick model of ethanol
A ball and stick model of diphenylethanol