Tumescence is a related term of protrusion.
As nouns the difference between tumescence and protrusion
is that tumescence
is a swelling due to the presence of fluid while protrusion
is (uncountable) the act of protruding.
A swelling due to the presence of fluid.
A swollen bodily organ; used especially of erectile tissue.
(uncountable) The act of protruding.
(uncountable) The state of being protruded.
(countable) Anything that protrudes.