cooper

As a letter f

is the sixth letter of the.

As a symbol f

is (label) symbol for fluorine.

As a noun cooper is

a craftsman who makes and repairs barrels and similar wooden vessels such as casks, buckets and tubs.

As a verb cooper is

to make and repair barrels etc.

As a letter r

is the eighteenth letter of the.

As a symbol r

is roentgen (unit ).

As a noun cooper is

a craftsman who makes and repairs barrels and similar wooden vessels such as casks, buckets and tubs.

As a verb cooper is

to make and repair barrels etc.

As a noun cooper

is a craftsman who makes and repairs barrels and similar wooden vessels such as casks, buckets and tubs.

As a verb cooper

is to make and repair barrels etc.

As an adjective undefined is

lacking a definition or value.