documentclass[12pt, twocolumn]{article}

% toggles for table information:
% symbol
    defrowsymb#1\{#1\} % on
   %defrowsymb#1\{}     % off
% name
    defrowname#1\{#1\} % on
   %defrownam#1\{}      % off
% sentence
    defrowsent#1\{#1\} % on
   %defrowsent#1\{}     % off

usepackage[a4paper, margin = 20mm, tmargin = 20mm]{geometry}
usepackage{changepage}
usepackage{enumitem}
usepackage{amsfonts}

begin{document}

begin{tabular}{@{}ccccc}
    rowsymb $alpha$  & $Delta$  & $varepsilon$ & $Gamma$  & $mu$     \
    rowname `alpha   & dv elta  & epsil=on     & g'amm'a & mv u     \
    rowsent comment 1 & comment 1 & comment 1     & comment 1 & comment 1 \
    rowsent comment 2 &           &               & comment 2 & comment 2 \
    rowsent           &           &               & comment 3 &           \
     \
    rowsymb $pi$     & $theta$  \
    rowname p`i      & thv eta  \
    rowsent comment 1 & comment 1 \
    rowsent           & comment 2 \
end{tabular}

end{document}

begin{tabular}{@{}ccccc}
    rowsymb $alpha$  & $Delta$  & $varepsilon$ & $Gamma$  & $lambda$  \
    rowname `alpha   & dv elta  & epsil=on     & g'amm'a & l'ambd`a \
    rowsent comment 1 & comment 1 & comment 1     & comment 1 & comment 1  \
    rowsent comment 2 &           &               & comment 2 & comment 2  \
    rowsent           &           &               & comment 3 &            \
     \
    rowsymb $mu$     & $pi$     & $theta$  \
    rowname mv u     & p`i      & thv eta  \
    rowsent comment 1 & comment 1 & comment 1 \
    rowsent comment 2 &           & comment 2 \
end{tabular}