Synonyms of 'nostalgia'
He felt a wave of nostalgia for the life he had left behind him.
Nostalgia isn't what it used to be
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If you feel longing or a longing for something, you have a rather sad feeling because you want it very much.
He felt a longing for the familiar.
A remembrance is a memory that you have of someone or something.
He had clung to the remembrance of things past.
Thesaurus for nostalgia from the Collins English Thesaurus
Nostalgia is an affectionate feeling you have for the past, especially for a particularly happy time.