Naming words (5)
I believe the answer is:
nouns
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">naming words</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for nouns that I've seen before include "They refer to people, places and things" , "Parts of speech" , "Identifying words" , "Words referring to people, places or things" , "Words indicating names" .)