different between outgrowth vs excrescency

English

out- +? growth

outgrowth (countable and uncountable, plural outgrowths)

Anything that grows out of something else.
1. A branch or offshoot of a plant.
2. An appendage of an animal.
3. A byproduct or consequence of an action or event.
Excessive growth.

From excrescence +? -ency.

excrescency (plural excrescencies)

An excrescent state or condition; the quality or fact of growing out of something; abnormal or excessive development
(obsolete) An exuberant outburst; an extravagance.
(obsolete) An excrescence, and excrescent growth; an outgrowth.
- 1665, Robert Hooke, Micrographia, XVIII:
  And having enquir'd into the History of Cork, I find it reckoned as an excrescency of the bark of a certain Tree […].
(obsolete) An abnormal, morbid, or unsightly outgrowth.

John A. Simpson and Edward S. C. Weiner, editors (1989) , “excrescency”, in The Oxford English Dictionary, 2nd edition, Oxford: Clarendon Press, ?ISBN

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