If you are talking about the past tense of the verb "to swim", the correct word would be "तरा" (tara). This is the past tense of the verb "तैरना" (tairna), which means "to swim".
If you are talking about a group of people swimming, the correct word would be "तैराकी" (tairaki) or "तैराकी करने वाले" (tairaki karne wale).
For example:
* "वह कुंड में तैरा" (vah kund mein tara) - He swam in the pond.
* "बहुत से लोग समुद्र में तैराकी कर रहे थे" (bahut se log samudra mein tairki kar rahe the) - Many people were swimming in the ocean.
Let me know if you have any other questions! 😊