Then and Therefore

Then adverb - In addition to what has been said.

Therefore is a synonym for then in purpose topic. In some cases you can use "Therefore" instead the word "Then" as an adverb or a conjunction.

Therefore adverb - For this or that reason.

Then is a synonym for therefore in purpose topic. You can use "Then" instead the word "Therefore" as an adverb or a conjunction, if it concerns topics such as as a result, for that reason.