I can see that happening.
(nuns are a particular category of sisters) ...
I never knew that. Thanks.
You're welcome.
The difference is roughly this:
"Nuns" live in a cloistered community, carrying out their vocation relatively isolated from the secular world. The nuns of St. Jude Monastery are an example
"Sisters" (should) live in community, but carry out their vocation in direct contact with the secular world. The "Missionaries of Charity", founded by Mother Teresa, are an example.