IPA: /ɛˈθɪʃən/
KK: /ɛˈθɪʃən/
A person who studies or writes about moral principles and values.
The ethician presented a compelling argument about the importance of honesty in society.
Ethician → It is formed from "ethos" (from Greek ἦθος, meaning character or custom) and the suffix "-ician" (meaning a specialist or practitioner). An ethician is a specialist in ethics, focusing on moral principles and character.
Think of 'ethos' which relates to character and morals, and remember that an 'ethician' is someone who specializes in understanding and applying those moral principles.