The difference between Aid and Benefit

When used as nouns, aid means help, whereas benefit means an advantage.

When used as verbs, aid means to (give) support (to), whereas benefit means to be or to provide a benefit to.

check bellow for the other definitions of Aid and Benefit

Aid as a noun (uncountable):

Help; assistance; succor, relief.

Examples:

"He came to my aid when I was foundering."
Aid as a noun (countable):

A helper; an assistant.
Aid as a noun (countable):

Something which helps; a material source of help.

Examples:

"Slimming aids include dietary supplements and appetite suppressants."
Aid as a noun (countable, British):

An historical subsidy granted to the crown by Parliament for an extraordinary purpose, such as a war effort.
Aid as a noun (countable, British):

An exchequer loan.
Aid as a noun (countable, legal):

A pecuniary tribute paid by a vassal to his feudal lord on special occasions.
Aid as a noun (countable):

An aide-de-camp, so called by abbreviation.

Examples:

"The incompetent general's brilliant aid often made priceless suggestions."

Aid as a verb (transitive):

To (give) support (to); to further the progress of; to help; to assist.

Benefit as a noun:

An advantage; help or aid from something.

Examples:

"It was for her benefit. His benefit was free beer."
Benefit as a noun (insurance):

A payment made in accordance with an insurance policy or a public assistance scheme.
Benefit as a noun:

An event such as a performance, given to raise funds for some cause.
Benefit as a noun (obsolete):

beneficence; liberality

Examples:

"rfquotek Webster (1623)"

Benefit as a verb (transitive):

To be or to provide a benefit to.
Benefit as a verb (intransitive):

To receive a benefit (from); to be a beneficiary.