Most American colonist ate bread and cold meat for breakfast.

Is most an adjective and could the word many be an adjective in a sentence

Yes to both of your questions.

Make sure you write "colonists" <~~plural!!

Yes, "most" can be an adjective when used to describe a majority or a large quantity of something. It is used to indicate a group or percentage that is the largest in number or amount.

For example:
- "Most people prefer coffee over tea."
- "She won most of the games in the tournament."

On the other hand, "many" is also an adjective that is used to describe a large number or quantity of something. However, it typically indicates a greater quantity than "most." While "most" implies a majority, "many" suggests a large and significant number.

For example:
- "Many people attended the concert."
- "There are many different flavors of ice cream to choose from."

In summary, both "most" and "many" can function as adjectives in a sentence, but "most" refers to a majority or largest portion, while "many" refers to a large and significant number.