sud

As a noun sud

is milk.

As a verb skud is

(northumbria) to hit.

As nouns the difference between surd and sud

is that surd is cheerfulness, alacrity, eagerness while sud is milk.

As nouns the difference between sum and sud

is that sum is noise (sound or signal generated by random fluctuations) while sud is milk.

As nouns the difference between stud and sud

is that stud is a male animal, especially a stud horse (stallion), kept for breeding or stud can be a small object that protrudes from something; an ornamental knob while sud is milk.

As a verb stud

is to set with ; to furnish with studs.

As nouns the difference between dud and sud

is that dud is (informal) a device or machine that is useless because it does not work properly or has failed to work, such as a bomb, or explosive projectile while sud is milk.

As a noun sud is

milk.

As nouns the difference between suds and sud

is that suds is lather, foam while sud is (informal) a bubble of lather or foam (the singular of suds).