What is difference between phenyl, benzyl, benzal and benzo group?

What  is difference between phenyl, benzyl, benzal and benzo  group?

 

When one H atom is replaced from benzene, then resulting group is called phenyl.

When benzene is directly attached with CH₂- group, resulting group is called benzyl group.

When benzene is directly attached with CH-  group, resulting group is called benzal group.

When benzene is directly attached with C- group, resulting group is called benzo group.

 

Note: The valence of C atom must be 4