| Functional group | Secondary suffix | Functional group | Secondary suffix |
| Alcohols (-OH) | -ol | Aldehydes (-CHO) | -al |
| Ketones (>C=O) | -one | Carboxylic acids (-COOH) | -oic acid |
| Amines (-NH2 ) | -amine | Acid amides (-CONH2 ) | -amide |
| Acid chlorides (-COCL) | -oyl chloride | Esters (-COOR) | -oate |
| Nitrites (-C=N) | -nitrite | Thioalcohols (-SH) | -thiol |
Nomenclature of compounds having polyfunctional groups:
When an organic compound contains two or more functional groups, one group is called the principal functional group while the others are called the secondary functional groups and are treated as substituents: The order of preference for principal group is: Carboxylic acid > acid anhydrides > esters > acid halides > amides > nitrites > aldehydes > ketone > alcohols > amines > double bond > triple bond
When the functional groups act as substituents, they ar named as:
| Functional group | Prefix | Functional group | Prefix |
| - COOH | Carboxy | -CHO | Formyl |
| -COOR | Alkoxy cabonyl or Carbalkoxy | >CO | Oxo or Kelo |
| -COCL | Chloroformyl | -OH | Hydroxy |
| -CONH2 | Carbamoyl | -SH | Mecaplo |
| -CN | Cyano | -NH2 | Amino |
| -OR | Akoxy | =NH | Imino |
| -X | Halo | -NO2 | Nitro |