fum

As a letter s

is the letter s with a.

As a noun fum is

smoke.

As nouns the difference between fum and smoking

is that fum is smoke while smoking is tuxedo, dinner suit.

As nouns the difference between time and fum

is that time is while fum is smoke.

As nouns the difference between fum and null

is that fum is smoke while null is zero, nil; the cardinal number before einn.

As nouns the difference between fumble and fum

is that fumble is (sports) a ball etc that has been dropped while fum is smoke.

As a verb fumble

is (intransitive) to idly touch or nervously handle.

As a noun fum

is smoke.

As an adverb fur is

out, outside.

As nouns the difference between fub and fum

is that fub is (obsolete) a plump young person or child while fum is smoke.

As a verb fub

is (obsolete) to put off by trickery; to cheat.

As a noun fum

is smoke.

As an adjective fumy is

producing, or filled with fumes.

As a noun fum

is smoke.

As an adjective tum is

entire, complete.

As a noun fum

is smoke.

As an adjective frum is

(lb) pious, observant; committed to obeying all the laws of judaism.