脚掌 

Pinyin: jiǎo zhǎng 
Meaning：Sole
Sentence: 什么东西搔了他的脚掌。Something tickled the soles of his feet.

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脚： 

Pinyin: jué,jiǎo,jiǎ,jiāo
Meaning: Foot; role 
Radical: 月
Stokes: 11
Traditional: 脚
Common words/Phrase: 
脚本 [jiǎo běn] 【scri-pt】
脚注 [jiǎo zhù] 【footnote】
脚印 [jiǎo yìn] 【footprint】
脚步 [jiǎo bù] 【step】
脚趾 [jiǎo zhǐ] 【toe】

掌：

Pinyin:  zhǎng 
Meaning: In charge of; palm
Radical: 手 
Stokes: 12 
Traditional: 掌 
Common words/Phrase:
掌握 [zhǎng wò] 【grasp】 
掌柜 [zhǎng guì] 【shopman】 
掌心 [zhǎng xīn] 【the centre of the palm】 
掌管 [zhǎng guǎn] 【control】 
掌权 [zhǎng quán] 【wield power】