Future perfect tense and Perfect tense

Future perfect tense noun - A perfective tense used to describe action that will be completed in the future.

Perfect tense and future perfect tense are semantically related. In some cases you can use "Perfect tense" instead a noun phrase "Future perfect tense".

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

Future perfect tense and perfect tense are semantically related. Sometimes you can replace phrase "Future perfect tense" with "Perfect tense", this phrases are similar.