This is the 1267th most frequent Polish word.
dziewczynki
"Dziewczynki" means "girls" (young girls) in English.
Here 'dziewczynki' is the subject, plural diminutive form of 'dziewczyna', referring to young girls engaged in an activity.
Dziewczynki bawią się w parku.
The girls are playing in the park.
In this sentence, 'dziewczynki' is the direct object in its accusative form, referring to the girls being observed.
Widzę dziewczynki na placu zabaw.
I see the girls at the playground.
Here 'dziewczynki' is the complement, used in the nominative case to describe the presence of girls in a location.