Preview:
df[df.columns[df.columns.str.contains(pat = 'WORDABC9')]]
   WORDABC9N123  WORDABC99N123
0            13             16
1            14             17
2            15             18

df[df.columns[df.columns.str.contains(pat = 'WORDABC9\\b')]]
Empty DataFrame
Columns: []
Index: [0, 1, 2]
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