Pluperfect and Perfective tense

Pluperfect noun - A perfective tense used to express action completed in the past.

Perfective tense and pluperfect are semantically related. In some cases you can use "Perfective tense" instead a noun "Pluperfect".

Perfective tense noun - A tense of verbs used in describing action that has been completed (sometimes regarded as perfective aspect).

Pluperfect and perfective tense are semantically related. Sometimes you can replace term "Pluperfect" with "Perfective tense", this terms are similar.