coordinating conjunction A word that joins comparable and equally important sentence elements: for, and, or, but, nor, yet, or so.
compound predicate Two or more verbs or verb phrases linked by and.
compound object Two or more words acting as an object and linked by and.
compound subject Two or more words acting as a subject and linked by and.
Many word pairs can be joined by and or another coordinating conjunction, including compound predicates, compound objects, and compound subjects. None of these pairs should be interrupted by a comma.
Note: This rule does not apply when the items in a pair are both independent clauses.