interpunct

As a letter s

is the letter s with a.

As a noun interpunct is

a punctuation mark consisting of a dot ().

As nouns the difference between interpunct and hypodiastole

is that interpunct is a punctuation mark consisting of a dot () while hypodiastole is a mark ⟨⟩ in late classical and byzantine greek used as a form of interpunct to show two words should be read separately in situations where they might otherwise be confused with an identically-spelled single word.