flattest

As a noun terms

is .

As an adjective flattest is

(flat).

is likely misspelled.

has no English definition.

As an adjective flattest

is superlative of flat.

As adjectives the difference between flatter and flattest

is that flatter is comparative of flat while flattest is superlative of flat.

As a noun flatter

is a type of set tool used by blacksmiths.

As a verb flatter

is to compliment someone, often insincerely and sometimes to win favour.

As adjectives the difference between flattest and fattest

is that flattest is superlative of flat while fattest is superlative of fat.