1. "Dic-" meaning "say" or "speak"
* Dictate: to speak or read aloud, especially for someone to write down
* Diction: the style of speaking or writing, the choice of words
* Dictionary: a book containing a list of words, their meanings, and often their pronunciations
* Dictum: a formal statement, especially one made by a judge
* Benediction: a blessing, a prayer of praise or thanks
* Contradiction: a statement that is opposite to another statement
* Edict: a formal proclamation or order, especially one issued by a sovereign
* Indict: to formally accuse someone of a crime
* Verdict: a decision made by a jury in a court of law
* Predict: to say what will happen in the future
* Contradictory: inconsistent, opposing
2. "Dic-" meaning "to teach" or "to learn"
* Didactic: intended to teach, especially in a moralizing way
* Disciple: a follower or student of a teacher or philosopher
* Discipline: training that corrects, molds, or perfects
* Doctrinal: relating to or based on a set of beliefs or principles
Keep in mind that the meaning of the root "dic" can vary depending on the word and its context.