Open chained hydroxy derivatives are called alcohols.
Some compounds with there common names as well as IUPAC names are given below :
Phenols are the hydroxy derivatives of aromatic hydrocarbons.
We have already discussed in nomenclature of aromatic compounds that all substituted phenols are named as derivatives of phenols. The positional numbers of the substituents are written with respect to -OH group.
However, poly-hydroxy phenols (containing two or more -OH groups) are named as hydroxy derivatives of benzene.
Since the priority of the -CHO group is higher than that of the -OH group, the compound is a derivative of aldehyde and not phenol.