Sub and Substract

Sub verb - To serve as a replacement usually for a time only.

Substract and sub are semantically related In some cases you can use "Substract" instead the word "Sub" as an adjective or an adverb or a verb.

Sub and substract are semantically related in answerable topic. Sometimes you can use "Sub" instead the word "Substract" as an adjective or an adverb or a verb, if it concerns topics such as lesser, secondary.