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Sentence is a group of words or a single word that expresses a complete thought, feeling, or idea. It usually contains an explicit or implied subject and a predicate containing a finite verb.

Compound is a word that is formed from two or more identifiable words, e.g. "blackbird," "notebook," "classroom," "cookbook," or "bullheaded," or, in some analyses, "mother-in-law" or "fire drill"
Sentence, are group of words that is describing something (subject) and uses other part of speech, this may serve as the predicate.

compound, is two sentences adjoin by conjunctions (and, or, but)