This is the 12952nd most frequent Swedish word.
swimmingpool
A man-made pool designed for swimming.
The word 'swimmingpoolen' here is used in its definite form to indicate a specific swimming pool that is being referred to.
Jag simmar i swimmingpoolen.
I am swimming in the swimming pool.
The word 'swimmingpool' in this sentence is in its indefinite form, discussing the general idea of swimming pools.
En swimmingpool är en plats för avkoppling.
A swimming pool is a place for relaxation.
The word 'swimmingpool' here is preceded by 'en', indicating it is an indefinite singular form, referring to a non-specific swimming pool.