They are coordinating conjunctions and subordinating conjunctions. These conjunctions connect words, phrases, and clauses of equal value. Clauses of equal value are called independent clauses and can stand on their own as separate sentences. Subordinating conjunctions introduce dependent clauses. Dependent clauses cannot stand alone as a single sentence.
Interjections are exclamatory words that express strong emotion.
Interjections have no other grammatical connection with or relationship to the rest of the sentence. Interjections may be followed by either commas or exclamation points. Alas, the poet was no more. Inc. PageWise makes no representations about the content published on this site. PageWise hereby disclaims all warranties and conditions with regard to this information, and user agrees that all such use is at its own risk.