A dictionary of Confusable Phrases: More Than 10,000 Idioms and Collocations

Post Office, the • post office
Post Office, the —the public department responsible for
postal services: The government encouraged the Post Office
to establish its own banking service.
post office —a building where postal business is carried out:
From the city post office he sent off two telegrams.
post-office order • postal order
post-office order —(UK) a money order in which the name
of the payee does not appear, but is transmitted from the issu-
ing to the paying post office: To procure a post-office order it
is requisite to apply at an office and wait while certain forms
are being filled up.
postal order —(UK) a money order issued by a post office for
plug at something
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one of a number of fixed sums payable at any post office to a
named payee: Postal orders are issued at the post office counter
upon payment of the postal order amount plus charges.
Note: 
Neither expression correlates in meaning with the phrase
mail order
— an order for goods to be sent by post: Mail order
has grown rapidly in recent years. As warehouses are situated
in low-rent areas and there is no need of a sales staff, overheads
are low.
pour point • pourpoint
pour point—the lowest temperature at which a substance
(such as oil) flows and below which it is too viscous to be
poured: The average specified pour-point for lubricating oils
has been lowered from 30 to about 
1
0°F.
pourpoint—(hist.) a man’s padded and quilted close-fitting
garment, worn in the 
1
4th and 
1
5th centuries: The military
pourpoint was of leather or cloth, stuffed and quilted.
practicable suggestion • practical suggestion
practicable suggestion —a suggestion that can be carried out,
or put into practice: This is not a practicable suggestion, at
least at this time, for several reasons. It is unlikely that two
new positions can be established…
practical suggestion —a suggestion that is useful if carried out
successfully: A practical suggestion is to increase the number of
training schools to meet the demand for additional teachers.