Grammatical connectors are words used to join two clauses or phrases together in a sentence. The two crossword solutions for the term 'grammatical connector' are 'COPULA' (6 letters) AND 'AND' (3 letters). A COPULA is a type of linking verb that connects the subject of a sentence with a predicate, such as 'is, ' 'was, ' 'SEEM, ' AND 'BECOME.' The word 'AND' is a coordinating conjunction that joins two independent clauses together.