arm
[名詞]
one of the two body parts that is connected to the shoulder and ends with fingers

腕 (うで), アーム
Ex: She used arm to push open the heavy door .
hand
[名詞]
the part of our body that is at the end of our arm and we use to grab, move, or feel things

手, ハンド
finger
[名詞]
each of the long thin parts that are connected to our hands, sometimes the thumb is not included

指 (ゆび), フィンガー
knee
[名詞]
the body part that is in the middle of the leg and helps it bend

膝 (ひざ), 膝関節 (ひざかんせつ)
Ex: She had a scar just below knee from a childhood bike accident .

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