IPA: /nɒˈstæl.dʒɪst/
KK: /nɑˈstæl.dʒɪst/
A person who often feels a sentimental longing for the past.
As a nostalgist, she often reminisces about her childhood memories.
Nostalgist → It is formed from "nostalgia" (from Greek "nostos" meaning return home and "algos" meaning pain) and the suffix "-ist" (meaning one who practices or is concerned with). A nostalgist is someone who experiences a longing or pain for the past, often wishing to return to it.
Think of someone who feels a 'pain' ('algos') for 'home' ('nostos') — that's what a nostalgist does, they long for the past.