As nouns the difference between ordnance and ordinant
is that ordnance is military equipment, especially weapons and ammunition while ordinant is one who ordains.
As an adjective ordinant is
ordaining; decreeing.
ordnance
English
Noun
(
en noun)
military equipment, especially weapons and ammunition.
artillery.
Usage notes
The British , now a civilian agency, retains its name from its origin as a military topographic survey of Britain during the Napoleonic Wars.
This word is often confused with ordinance, which is a law or legal statute.
Related terms
* unexploded ordnance