The difference between Breakfast and Eat
When used as nouns, breakfast means the first meal of the day, usually eaten in the morning, whereas eat means something to be eaten.
When used as verbs, breakfast means to eat the morning meal, whereas eat means to consume (something solid or semi-solid, usually food) by putting it into the mouth and swallowing it.
check bellow for the other definitions of Breakfast and Eat
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Breakfast as a noun:
The first meal of the day, usually eaten in the morning.
Examples:
"You should put more protein in her breakfast so she will grow."
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Breakfast as a noun (by extension):
A meal consisting of food normally eaten in the morning, which may typically include eggs, sausages, toast, bacon, etc.
Examples:
"We serve breakfast all day."
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Breakfast as a noun:
The celebratory meal served after a wedding (and occasionally after other solemnities e.g. a funeral).
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Breakfast as a noun (largely, _, obsolete, outside, religion):
A meal eaten after a period of (now often religious) fasting.
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Breakfast as a verb (intransitive):
To eat the morning meal.
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Breakfast as a verb (transitive):
To serve breakfast to.
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Eat as a verb (ambitransitive):
To ingest; to be ingested. To consume (something solid or semi-solid, usually food) by putting it into the mouth and swallowing it. To consume a meal. To be eaten.
Examples:
"He’s eating an apple. / Don’t disturb me now; can't you see that I’m eating?"
"What time do we eat this evening?"
"It's a soup that eats like a meal."
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Eat as a verb (transitive):
To use up. To destroy, consume, or use up. To damage, destroy, or fail to eject a removable part or an inserted object. To consume money or (other instruents of value, such as a token) deposited or inserted by a user, while failing to either provide the intended product or service, or return the payment.
Examples:
"This project is eating up all the money."
"The VHS recorder just ate the tape and won't spit it out."
"John is late for the meeting because the photocopier ate his report."
"The video game in the corner just ate my quarter."
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Eat as a verb (transitive, informal):
To cause (someone) to worry.
Examples:
"What’s eating you?"
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Eat as a verb (transitive, business):
To take the loss in a transaction.
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Eat as a verb (ambitransitive):
To corrode or erode.
Examples:
"The acid rain ate away the statue.  The strong acid eats through the metal."
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Eat as a verb (transitive, informal):
To perform oral sex. To perform oral sex on someone. To perform oral sex on a body part.
Examples:
"'Eat me!"
"I ate his ass."
"Yeah, eat that dick."
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Eat as a noun (colloquial):
Something to be eaten; a meal; a food item.