What's the difference between swob and swop?

Swob

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Definition:

• (n. & v.) See Swab.

Example Sentences:

Swop

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Definition:

• (v. & n.) Same as Swap.

Example Sentences:

• (1) The poor showing could put into question the position of President Dmitry Medvedev , expected to swop roles with Putin after the March election.