In case of invariable nouns:
-> E.g. Cards, Checkers, dominoes, ...
=> Nouns in /-ics/ referring to sciences, branches of study, or activities
-> E.g. Acoustics, ceramics, gymnastics, phonetics, ...
-> E.g. Ardennes, United States, ...
=> Some names of diseases and ailments
-> E.g. Measles, rabies, shingles, ...