an/année, jour/journée

[worldly heath]

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an/année, jour/journée

[wispy bridge]

as you said, jour and an are used for counting, even if it's just one, as opposed to several.
journée and année are referring to the entire time period within. It's more focused on what's happening during that time, from start to finish.

(even outside of counting, jour/an can also be used if you're just indicating a day or a year, because the focus is on the date for an outside point of view and not the time period. that's why you can have both "l'an prochain" and "l'année prochaine", these ones are pretty interchangeable)

soir/soirée also exists.
there might be other ones like nuit/nuitée as well but they're rarer (nuitée mosty used in hotels afaik)

[cerulean rivet]

I forgot about soir/soirée, merci