Pinyin: yǒng chí
Meaning：Swimming pool
Sentence：公园里有一个游泳池。There is a swimming pool in the park.

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泳：

Pinyin: yǒng
Meaning: Swimming
Radical: 氵
Stokes: 8
Traditional: 泳
Common words/Phrase:
泳装 [yǒng zhuāng] 【cossie】
泳裤 [yǒng kù]【swim trunks】
泳圈 [yǒng quān] 【swimming life-buoy】
泳镜 [yǒng jìng] 【goggles】
泳道 [yǒng dào] 【swimming course】

池：

Pinyin: chí
Meaning: Pond; reservoir; pool
Radical: 氵
Stokes: 6
Traditional: 池
Common words/Phrase:
池塘 [chí táng] 【pond; pool】
池子 [chí zi] 【pond】
池座 [chí zuò] 【loge】
池沼 [chí zhǎo] 【pond】
池窑 [chí yáo] 【tank furnace】