Source: Usufruct – Wikipedia
Usus (use) is the right to use or enjoy a thing possessed, directly and without altering it
Fructus (fruit, in a figurative sense) is the right to derive profit from a thing possessed: for instance, by selling crops, leasing immovables or annexed movables, taxing for entry, and so on.
Abusus (literally abuse), the right to alienate the thing possessed, either by consuming or destroying it (e.g., for profit), or by transferring it to someone else (e.g., sale, exchange, gift).
Someone enjoying all three rights has full ownership.