Basically, the term ' more ' refers to a larger amount or degree, while ' most ' refers to the largest amount or degree. In other words, 'more' is considered a comparative form, while 'most' is considered a superlative form.

When we talk about two items, we use ‘more’ to show that one item has greater quantity or quality than the other. For example, “She has more apples than me.” It’s a way to say that someone or something has a higher degree of something compared to another. On the other hand, when we talk about three or more items, ‘most’ comes into play.

Both ' more ' and ' most ' are adverbs, adjectives, nouns, and pronouns. They are both four-letter words that start with m. However, they have different meanings. ' More ' means you want a higher quantity ' Most ' means you want the highest or most significant amount or level.

In a general sense, more is used when referring to a greater or additional amount or degree. Most, on the other hand, is used when referring to greatest in amount or degree. The key difference between more and most is that while more is considered as a comparative form, most is considered the superlative form.

The comparative form of many/much is more; and the superlative form of many/much is most. We can use more and most with countable and uncountable nouns.