Excluder vs Excludes - What's the difference?

As a noun excluder

is something which excludes.

third-person singular of exclude.

(en noun)

Something which excludes

(head)

(exclude)

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(exclud)

To bar (someone) from entering; to keep out.

To expel; to put out.

to exclude young animals from the womb or from eggs

(legal, of evidence) To refuse to accept as valid.

(medicine) To eliminate from diagnostic consideration.

* include