The difference between Petty officer and Po
When used as nouns, petty officer means a non-commissioned officer in the canadian, us and uk navy and the us coast guard, whereas po means a peacock.
check bellow for the other definitions of Petty officer and Po
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Petty officer as a noun:
A non-commissioned officer in the Canadian, US and UK Navy and the US Coast Guard; roughly equivalent to a sergeant in the army
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Po as a noun (obsolete):
A peacock.
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Po as a noun (UK, Australia, NZ, colloquial, dated):
A chamberpot.