IPA: //aɪˈdiːələdʒɪst//
KK: /aɪˈdiːələdʒɪst/
A person who develops or supports a particular set of ideas or beliefs, especially in politics or philosophy.
The ideologist presented a new theory on social justice that sparked much debate.
Ideologist → It is formed from "idea" (from Greek "idea", meaning form or concept) and "-logist" (from Greek "logistēs", meaning one who studies or specializes in). The word "ideologist" refers to a person who studies or specializes in ideas or ideologies.
Think of someone who studies or specializes in 'ideas' — 'idea' comes from Greek, and '-logist' means a person who studies.