flipper

US /ˈflɪp.ɚ/
UK /ˈflɪp.ɚ/
"flipper" picture
1.

a broad flat limb (as of a seal or whale) adapted for swimming

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The seal used its flippers to glide through the water.
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Whales have powerful flippers for propulsion.
:
finpaddle
2.

a large flat rubber shoe worn by swimmers for propulsion through water

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He put on his diving mask and flippers before jumping into the ocean.
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Learning to swim with flippers can make you faster.
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swim finsdiving fins