Past perfect tense and Perfective tense

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

Perfective tense and past perfect tense are semantically related. In some cases you can use "Perfective tense" instead a noun phrase "Past perfect tense".

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

Past perfect tense and perfective tense are semantically related. Sometimes you can replace phrase "Past perfect tense" with "Perfective tense", this phrases are similar.