sire |
sir |
As nouns the difference between sire and sir
is that
sire is a lord, master, or other person in authority, most commonly used vocatively: formerly in speaking to elders and superiors, later only when addressing a sovereign while
sir is a man of a higher rank or position.
As verbs the difference between sire and sir
is that
sire is of a male: to procreate; to father, beget while
sir is to address (someone) using "sir".
As an initialism SIR is
surface insulation resistance
