/ˈdəblət/ – Phrase
Definition: cặp từ có cùng nguồn gốc nhưng khác nhau về hình thức hoặc ý nghĩa.
A more thorough explanation: two words which have the same or nearly the same meaning which are used as a phrase in English legal language
Example: “Cease and desist” is one of many doublets left over from the time of the Norman conquest when it was common in law to combine a French or Latin term with its Anglo-Saxon synonym.