A Word Used as a Substitute for a Related Entity

This page is the CodyCross answer for the clue below from Fauna and Flora, Group 167, Puzzle 5 (Commensalism).

Question is: A Word Used as a Substitute for a Related Entity

and the answer is: METONYM

Word Meaning:

METONYM — (grammar) A word that names an object from a single characteristic of it or of a closely related object; a word used in metonymy.

Definitions from Wiktionary.