Egomania is basically intolerably self-centred. In a more technical sense, it's an obsession -- an obsessive preoccupation with one's own self, usually in the form of following own impulses and have delusions of grandeur.
Megalomania is a rather loose term, and usually means have delusional fantasies of omnipotence (having unlimited or very great power, whatever 'power' might mean to that person). Interestingly, megalomania was the standard term for narcissistic personality disorder before the 1960s (so far as I recall from my psychology degree over 30 years ago).
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Explanation:
Amal means any action or deed. It can be good or bad. As per Islam the reward or punishment of amal is based on neeyah (intention). Islam, sharia and akhlaq are very fundamental in its teaching and so is aqeedah. It is another significant foundation and the three are inter-linked to each other. Aqeedah forms the basis of iman (firm belief), hence if one of the components is missing, one's iman is lost or later becomes unbalanced.
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A synonym is a word that is similar to other words, but not the same. Take the word flawed. A synonym could be defective or faulty. A vocabulary word is a word that is new to somebody and could be very prestigious and formal. For example, the word adequate could be vocabulary. Or maybe the word delectable.
P.S: If you're wondering, adequate means good or fine, and delectable means tasty or delicious.