IPA: /njuːˈmɪz.mætɪks/
KK: /nʊˈmɪz.mə.tɪks/
The study or collection of money, coins, and sometimes medals.
He has a deep interest in numismatics and often attends coin shows.
Numismatics → It is formed from "nomisma" (Greek, meaning coin or currency) and the suffix "-ics" (meaning the study of). The word refers to the study of coins, currency, and related objects.
Think of 'nomisma' which means coin, and remember that numismatics is the study of coins and currency.