interjection - Simple English Wiktionary

Noun

(countable) An interjection is a word that shows an emotion. It is not grammatically part of the sentence.
The word "Yikes" is an interjection in the phrase "Yikes, what a scare."

Grammar (edit)
parts of speech	noun - verb - adjective - adnoun - adverb - determinative/determiner - article - participle - pronoun - conjunction - preposition - interjection
grammatical functions	head - dependent - subject - predicate - predicator - object - complement - predicative complement - predicative adjunct - predicative oblique - appositive oblique - modifier - supplement - adjunct - determiner/specifier
clauses	main clause - dependent clause - subordinate clause - relative clause