Happen vs. Occur

Happenverb

(intransitive) To occur or take place.

‘Let me tell you how it happened.’;

Occurverb

(intransitive) To happen or take place.

‘The liftoff will occur in exactly twelve seconds.’;

Happenverb

To happen to; to befall.

Occurverb

(intransitive) To present or offer itself.

‘I will write if the opportunity occurs.’;

Happenverb

To do or occur by chance or unexpectedly.

‘Take an umbrella in case it happens to rain.’; ‘Do you happen to have an umbrella?’; ‘I happened to get wet.’;

Occurverb

(impersonal) To come or be presented to the mind; to suggest itself.

Happenverb

or upon}} To encounter by chance.

Occurverb

To be present or found.

‘The chemical monofluoroacetate occurs in all parts of Dichapetalum cymosum, and is responsible for its toxic effects.’;

Happenadverb

maybe, perhaps.

Occurverb

To meet; to clash.

‘The resistance of the bodies they occur with.’;

Happenverb

To come by chance; to come without previous expectation; to fall out.

‘There shall no evil happen to the just.’;

Occurverb

To go in order to meet; to make reply.

‘I must occur to one specious objection.’;

Happenverb

To take place; to occur.

‘All these things which had happened.’;

Occurverb

To meet one's eye; to be found or met with; to present itself; to appear.

‘In Scripture, though the word heir occur, yet there is no such thing as "heir" in our author's sense.’;

Happenverb

come to pass;

‘What is happening?’; ‘The meeting took place off without an incidence’; ‘Nothing occurred that seemed important’;

Occurverb

To happen; to take place; as, I will write if opportunity occurs.

Happenverb

happen, occur, or be the case in the course of events or by chance;

‘It happens that today is my birthday’; ‘These things befell’;

Occurverb

To come to the mind; to arise in the mind; to suggest itself; to be presented to the imagination or memory; - of an idea or thought; as, it never occurred to me to call John to ask.

‘There doth not occur to me any use of this experiment for profit.’;

Happenverb

chance to be or do something, without intention or causation;

‘I happen to have just what you need!’;

Occurverb

come to pass;

‘What is happening?’; ‘The meeting took place off without an incidence’; ‘Nothing occurred that seemed important’;

Happenverb

come into being; become reality;

‘Her dream really materialized’;

Occurverb

come to one's mind; suggest itself;

‘It occurred to me that we should hire another secretary’; ‘A great idea then came to her’;

Happenverb

come upon, as if by accident; meet with;

‘We find this idea in Plato’; ‘I happened upon the most wonderful bakery not very far from here’; ‘She chanced upon an interesting book in the bookstore the other day’;

Occurverb

to be found to exist;

‘sexism occurs in many workplaces’; ‘precious stones occur in a large area in Brazil’;