If you study the definitions, “”Me’anes” is not a perfect translation of the English word “rape”. For example, one can consent and still be raped (e.g. a minor if the other party is an adult). When discussing “legalese” it is best to stick to the original langauge. The are other distinctions in the definitions. It isn’t a one to one correlation.
The rebbe who thinks they are translations probably hasn’t studied enough law and linguistics, and should stick to the original Hebrew term without using an English term he may not fully undertand.