This is the 2663rd most frequent Russian word.
шутки
Jokes.
The word 'шутками' is in the instrumental plural form, indicating the means by which we laughed — and it means 'jokes'.
Мы смеялись над его шутками весь вечер.
We laughed at his jokes all evening.
The word 'шутка' is in the singular nominative form, referencing a specific joke that was told.
Шутка, которую он рассказал, была смешной.
The joke he told was funny.
The word 'шутки' is in the nominative plural form, denoting jokes in general as a topic.