Interjection
Interjections there the word which expresse sudden feelings and emotions of heart such as joy, grief, wonder, fear, anger, surprise, approval and disgust etc.
List of Common Interjections
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O!, Oh!, Ooh!, Aye!, Hello!, Well!, Ha!, Ho!, Hurrah!, Ah!, Alas!, Hush! etc.
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There are certain groups of words that are also used as Interjections
Examples
 Ah me!,  Dear me!, Good heavens! Good gracious! Well done! For shame! etc.
Note: An Interjection is mostly followed by an exclamatory mark (!).
Examples
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Hello! What are you doing there?
Hurrah! We have won the match.
Oh! I got such a fright.