No, that's not quite right. The two words (aside from the prefix) do not come from the same root and etymologically are quite opposite; "apocrypha" is what is hidden and "apocalypse" is what is revealed. The term "Apocrypha" is referentially problematic beause it usually refers to a category of deuterocanonical literature that excludes the "Old Testament pseudepigrapha," yet the latter category includes various apocalypses (including 1 Enoch) and apocryphons that are not part of the capitalized "Apocrypha" but which are apocryphal for being "hidden" books. And "apocalypse" is not the same thing as prophecy, they are quite distinct literary genres. In prophecy, the prophet speaks for God as his authorized representative and delivers God's oracles. In apocalypse, an angel or other mediator reveals things to the writer, or shows them to him, or interprets them for him (if they are revealed through dreams or visions). There are many, many literary motifs in apocalypse that are not found in OT prophecy. And sometimes what is revealed through apocalyptic revelation has nothing to do with the future or end times, such as the cycles of the sun and moon and the phases of the moon, as revealed to Enoch in the Book of Luminaries. Finally, "Apocryphal" doesn't necessarily have anything to do with "stuff in the past", as the deuterocanonical Apocrypha includes wisdom literature and (following the Eastern tradition) other psalms.