Thiol or Mercaptan, Sulphide, Nitril or Cyanide and Nitro

Thiol or Mercaptan   -SH or  eg.  CH3CH2SH   ethyl mercaptan or ethanthiol
Sulphide  -S-  eg. CH3CH2-S-CH2CH3 diethylsulphide  
 
Nitril or Cyanide   -CN    eg. CH3CN ethyl cyanide or ethanitril  
Nitro   -NO2       eg. CH3CH2NO2 nitroethane    

           Thiols, Nitros, Cyanides and Sulphides Worksheet