The difference between Chance and Occur

When used as verbs, chance means to happen by chance, to occur, whereas occur means to happen or take place.

Chance is also noun with the meaning: an opportunity or possibility.

Chance is also adverb with the meaning: perchance.

Chance is also adjective with the meaning: happening by chance, casual.

check bellow for the other definitions of Chance and Occur

Chance as a noun (countable):

An opportunity or possibility.

Examples:

"We had the chance to meet the president last week."
Chance as a noun (uncountable):

Random occurrence; luck.

Examples:

"Why leave it to chance when a few simple steps will secure the desired outcome?"
Chance as a noun (countable):

The probability of something happening.

Examples:

"There is a 30 percent chance of rain tomorrow."
Chance as a noun (countable, archaic):

What befalls or happens to a person; their lot or fate.

Chance as a verb (archaic, intransitive):

To happen by chance, to occur.

Examples:

"It chanced that I found a solution the very next day."
Chance as a verb (archaic, transitive):

To befall; to happen to.
Chance as a verb:

To try or risk.

Examples:

"Shall we carry the umbrella, or chance a rainstorm?"
Chance as a verb:

To discover something by chance.

Examples:

"He chanced upon a kindly stranger who showed him the way."
Chance as a verb (Belize):

To rob, cheat or swindle someone.

Examples:

"I was chanced out of my money by that fast-talking salesman."

Occur as a verb (intransitive):

To happen or take place.

Examples:

"The liftoff will occur in exactly twelve seconds."
Occur as a verb (intransitive):

To present or offer itself.

Examples:

"I will write if the opportunity occurs."
Occur as a verb (impersonal):

To come or be presented to the mind; to suggest itself.
Occur as a verb (intransitive, sciences):

To be present or found.

Examples:

"The chemical monofluoroacetate occurs in all parts of ''Dichapetalum cymosum'', and is responsible for its toxic effects."