Weak is an adjective, while the word week is a noun. Weak means are lacking in power, stamina, or force, while a week is seven days. One can be physically, emotionally, financially, or spiritually weak, but a week is a period from Sunday to the following Sunday. Weak is a word that constitutes something fragile and not strong.
The word weak may also be used to describe how something is lacking or missing something to give it power or potency. As an example, you could say, "This coffee is weak."
Week and Weak are two words with a different meaning entirely. However, the only similarity between Week and weak is that they are pronounced exactly the same way. They are examples of homophones, i.e., words with the same sounds but different spelling and meaning. A week and weak have the same sound but differ in spelling and meaning. Week simply means a period of seven days beginning from Sunday to Saturday. Which means in a week there are seven days.
It is mostly used as a noun. For example, the program is scheduled to hold in the Second Week of July. Weak, on the other hand, is an adjective which describes someone that is having little strength or power. For example, I declined to work with John because I was very weak. It is also used for situations where someone lacks the power to prove his point beyond any reasonable doubt. For example, The prosecution produced a weak case.
Week and weak are homophones. A homophone is two words that sound alike, but have different meanings. Along with sounding the same, there is only one letter difference between them, which is the a in Weak. Week refers to the period of seven days.
Those days are Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, and Sunday. Weak is the opposite of strong. It is an objective to describe someone, while week is a noun. Examples of these words in sentences are "I can't wait for this week to be over soon" and "He knows he is too weak to lift those weights".