humdinger

As a letter s

is the letter s with a.

As a noun humdinger is

something that is particularly outstanding, unusual, or exceptional.

As nouns the difference between humdinger and null

is that humdinger is something that is particularly outstanding, unusual, or exceptional while null is zero, nil; the cardinal number before einn.

As nouns the difference between humdinger and crackerjack

is that humdinger is something that is particularly outstanding, unusual, or exceptional while crackerjack is an exceptionally fine or excellent thing or person.

As an adjective crackerjack is

exceptionally fine or excellent; top-notch; high quality.

As nouns the difference between humdinger and sockdolager

is that humdinger is something that is particularly outstanding, unusual, or exceptional while sockdolager is (us|slang|obsolete) a hard hit, a knockout or finishing blow.

As a noun humdinger

is something that is particularly outstanding, unusual, or exceptional.

As a proper noun diamond is

of modern usage, from the name of the gem.

As nouns the difference between humdinger and doozie

is that humdinger is something that is particularly outstanding, unusual, or exceptional while doozie is (us) something that is extraordinary often used in the context of troublesome, difficult or problematic, but can be used positively as well.