What Are Their Main Differences?

'Much' is used mainly in negative and interrogative sentences unless we are talking formally.
'A lot' can be used in informal affirmative sentences as an alternative for 'much'.

Differences

Types of Sentences Which They Are Used in

'Much':

is mostly used in negative and interrogative sentences in informal situations. Whenever we use much in an affirmative sentence it sounds a little formal to the audience.

Example

Does it cost much?

He doesn’t have much money which makes it difficult for him to live abroad.

'A lot':

is used in negative, interrogative and affirmative sentences. In affirmative sentences, it is used as an alternative for 'much'. Although we can use 'a lot' in negative sentences and questions, it is common to use 'much' and 'many'. 'A lot' and 'a lot of' are commonly used in affirmative sentences.

Example

They have many friends. (Formal)

They have a lot of friends. (Informal)

Singular or Plural Nouns?

'Much':

is followed by singular uncountable nouns. As a result, it is followed by singular verbs as well.

Example

This is much money. I don’t know how to spend it.

He did not have much faith on her.

'A lot':

is followed by both singular uncountable and plural countable nouns. So, it is obvious that we can use a lot or a lot of with either singular or plural verb.

Example

The teacher gives a lot of non-important information.

Our son has a lot of smart ideas on this subject. I am proud of him.

Similarities

Grammatical Functions

'Much' and 'a lot':

Determiners are used before the nouns to define them. As a determiner, 'much' is used before uncountable singular nouns. As a pronoun, much is used alone with no nouns following it. As you know, adverbs can come before adjectives and other adverbs, so, 'much' as a determiner is used before adverbs and adjectives. As you can see 'a lot' is formed by two words, one is the 'article' a and one is the 'noun' lot. But as a phrase, they are used as determiners before plural countable and singular uncountable nouns , in this case, 'a lot' is followed by the term 'of'.

Example

It takes much patience to have an orange tree. → determiner

"How much do you like the car?" "I like it a lot." → pronoun

A lot of people are going to this big ceremony of the country. → determiner

"How much does it cost?" "Not much." → pronoun

Aurora used to be much over-weight back then. → adverb

My daughter does yoga a lot. → adverb

My daughter does yoga too much. → adverb

What They Refer to

'Much' and 'a lot':

refer to a large amount. By quantity, we mean an amount or a number. So, these two words are being considered 'quantifiers'.

Example

A lot of us are allowed to choose an optional course.

They couldn't find much milk, so they used butter instead.

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