As nouns the difference between spet and sput
is that spet is (obsolete) spittle while sput is an annular reinforcement in a steam boiler, to strengthen a place where a hole is made.
As a verb spet
is to spit; to throw out.
spet
English
Noun
(-)
(obsolete) spittle
sput
English
Noun
(
en noun)
An annular reinforcement in a steam boiler, to strengthen a place where a hole is made.
(
Webster 1913)