Group of words which express feelings, curses, and wishes or are used to initiate conversation (Ouch!, Darn!, Hi!). Their status as a grammatical category is debatable, as they behave strangely in respect to morphology, syntax, and semantics: they are...

An interjection is a part of speech that usually has no grammatical connection to the rest of the sentence and simply expresses emotion on the part of the speaker, although most interjections have clear definitions. Filled pauses such as uh, er, um, are...