  Tetrad based equation for Dirac-K\"{a}hler particle is solved in spherical
coordinates in the flat Minkocski space-time. Spherical solutions of boson type
(J =0,1,2,...) are constructed. After performing a special transformation over
spherical boson solutions of the Dirac-K\"{a}hler equation, 4 \times 4-matrices
U(x) \Longrightarrow V(x), simple linear expansions of the four rows of new
representativeof the Dirac--K\"{a}hler field V(x) in terms of spherical fermion
solutions \Psi_{i}(x) of the four ordinary Dirac equations have been derived.
However, this fact cannot be interpreted as the possibility not to distinguish
between the Dirac-K\"{a}hler field and the system four Dirac fermions. The main
formal argument is that the special transformation (I \otimes S(x)) involved
does not belong to the group of tetrad local gauge transformation for
Dirac-K\"{a}hler field, 2-rank bispinor under the Lorentz group. Therefore, the
linear expansions between boson and fermion functions are not gauge invariant
under the group of local tetrad rotations.
