Key Difference: People get easily confused with these two words Scared and Afraid,which are adjectives and both express the same degree of fear. The primary difference is Scared can be used for both, before a noun and predicative after a verb, while Afraid is generally not used before a noun, but rather followed by a verb.
As both the words are adjectives and in some cases are even interchangeable, but afraid has a different meaning which is not the same meaning for scared. The confusion with both these words come as both afraid and scared deal with fear.
Thus, Afraid here means having a feeling of fear or apprehension while Scared means being in a state of fright, suddenly alarmed or panicking.
Afraid is used as a synonym of Scared and sometimes vice versa, but using scared always instead of afraid is incorrect. Afraid is also used to be polite to share some bad news, regret or apology and is also used to formally decline something like for example, I am afraid, I will not be able to enjoy the party this weekend. The grammar for scared and afraid also differs with use of 'by' as preposition that often follows scared, however using afraid in the same sense does not make any sense, like for example, The small kid was scared by the insect, whereas you cannot be afraid by something or things.
Afraid makes more sense when it is used after describing the noun, for example;
Though both the words can be followed using 'of' and 'ing' form.
Both the words can be followed by a to+infinitive like:
Position of afraid is followed by a verb and not generally used before a noun like:
Synonyms of both the words express fear as a emotion but at varying levels like:
Scared is similar to frightened or terrified and expresses how people feel like I felt scared when the elevator stopped.
Frightened means afraid or fearful.
Terrified means to be extremely scared or be afraid.
Spooked means to be startled or be suddenly alarmed like being scared.
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