Tier in Forest tree- how to align properly

Question

I've create this tree in LaTex using the package forest. However, I cannot understand why the command tier doesn't work properly. I should have F, P, D and R align on the same line and M, S and L on a different line, just a bit above the other one. The position of m and n is fine.
Could you help me? Thanks
documentclass[border=0.5cm]{standalone}
usepackage{forest}
forestset{
nice empty nodes/.style={
for tree={calign=fixed edge angles}, delay={where content={}{shape=coordinate,
for current and siblings={anchor=north}}{}}
}
  }
begin{document}
begin{forest}
[$Omega$, nice empty nodes
[G]
[[[F, tier=word][[P, tier=word][[D, tier=word][[R, tier=word][M, tier=word1[m][n]]]]]][[S, tier=word1][L, tier=word1]]]]]]
end{forest}
end{document}

Zarko · Accepted Answer

If I understood you correctly, than you like achieve the following result:

It is obtained by changing declaration of nodes anchors:
documentclass[border=0.5cm]{standalone}
usepackage{forest}

begin{document}
    begin{forest}
for tree={calign=fixed edge angles,
          anchor=north
          },
delay={where content={}{shape=coordinate}{}},
%  
[$Omega$
    [G]
    [
        [
            [F, tier=word]
            [
                [P, tier=word]
                    [
                        [D, tier=word]
                        [
                            [R, tier=word]
                                [M, tier=word
                                    [m]
                                    [n]
                                ]
                        ]
                    ]
            ]
        ]
        [
            [S, tier=word]
            [L, tier=word]
        ]
    ]
]
end{forest}
end{document}

Tier in Forest tree- how to align properly

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