What's different between occur - happen ?

[أحمد_ليبيا]

- What's a connotation of both and What each of them a word sugges ?

[آسيهي]

السلام عليكم
اخي احمد ليس هناك فرق بينهما
happen مرادف لــ occur
و تستطيع استعمالهما في نفس الجملة
فمثلا:
it happend last night
it occurred last night
دمت

[الـتميمي]

They have the same meaning but if you want to use these words in a paragraph or in an essay then it's better to use them all in two different sentences

[أحمد_ليبيا]

Thanks aLot