ink

As a noun ink

is a pigment (or dye)-based fluid used for writing, printing etc.

As a verb ink

is to apply to; to cover or smear with ink.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between ink and blot

is that ink is a pigment (or dye)-based fluid used for writing, printing etc while blot is a norse pagan ritual sacrifice, now performed by the followers of asatru.

As a verb ink

is to apply to; to cover or smear with ink.