Topics (6)
I believe the answer is:
themes
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">topics</span>' is the definition.<br/ ><span class="explanation-format__explanation">('theme' can be a synonym of 'topic')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for themes that I've seen before include "Topics, ideas, motifs" , "Recurrent ideas" , "'Subjects, topics (6)'" , "Subject matters, motifs" , "Motifs, subjects" .)