cannon — canon
[Both these words have the same sound]
1. “… South Africa and Zanzibar. The main … Two canons stood guard at the entrance to the fortified castle. Inside, a huge courtyard …”
2. “… The thickness of the castle walls varies from … facilitate the firing of canons from them. Most of the castle rooms …”
In both cases the word “cannons” was required!

a cannon, a large fire-arm
“Cannon” (with a double ‘n’; for the right pronunciation, please click here‘) is
(a) a ‘large, heavy, old-fashioned but powerful gun’,
(b) ‘the loop at the top of a bell by which it is hung’,
(c) ‘a kind of shot in games such as billiards and pool’,
e.g.
The enemy soldiers used (fired) cannons to destroy the outer wall of the fort.
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the Great Canon of St Andrew of Crete…
“Canon” (with a single ‘n’; for the right pronunciation, please click here) is
(a) ‘an established law of the Christian Church’,
(b) ‘a Christian priest with special responsibilities’ (It is also used humorously to refer to a person as ‘a big shot in the church’.);
(c) ‘a general rule, truth, etc.’,
and
(d) ‘a criterion or standard’,
e.g.
The Rev Canon Paul James is going to pray for us in our new church.
This play (drama) does not belong to the Shakespearean canon.

