what is the difference between 'saudade' and 'saudades'? can you give examples, please?

Saudade: An Untranslatable, Undeniably Potent Word : Alt.Latino : NPR

How to pronounce saudade in Spanish

Is “saudade” really untranslatable?Expat Since Birth – A Life

What's the difference between 'saudades' and 'saudade'? - Quora

guilty pleasure. — saudade; 1 (m)

The meaning of Saudade the most Portuguese word

What is the real meaning of the Portuguese word 'saudade?' - Quora

IELTS Online Tests - 'Saudade' is an untranslatable Portuguese

How to use the word SAUDADE

5 nearly perfect equivalents of 'saudade' – Andreia Esteves

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What's the difference between 'saudades' and 'saudade'? - Quora

Why the Portuguese experience “saudade” differently…

The meaning of Saudade the most Portuguese word