英语单词本就是词根＋词缀构成的。tend和attend存在部分重叠的意思，但其它意思完全不同。至于pocket，是口袋，衣服上的口袋A pocket is a kind of small bag that forms part of a piece of clothing, and that is used for carrying small things such as money or a handkerchief.

packet是pack打包的派生词，包裹。A packet is a small container in which a quantity of something is sold. Packets are either small boxes made of thin cardboard, or bags or envelopes made of paper or plastic.

但要注意packet和package的区别，两个都是包括，但packet是小包裹，这从它的词缀et就能看出来。et可作为名词后缀，表示小东西，比如rivulet小河 lionet小狮子 floweret小花。当然，有些词感觉确实有可能存在写错的情况，比如favor和favour……