straightener

As a noun straightener

is a pair of metal tongs with heated ceramic plates used for straightening hair.

As a verb hair is

to hate.

As nouns the difference between straightener and flatiron

is that straightener is a pair of metal tongs with heated ceramic plates used for straightening hair while flatiron is a simple iron (for pressing laundry) which is heated on a stove.

As an adjective flatiron is

having a flatiron shape.

As nouns the difference between straightening and straightener

is that straightening is the act of making something straight while straightener is a pair of metal tongs with heated ceramic plates used for straightening hair.

As a verb straightening

is .

As nouns the difference between straightener and smoothing

is that straightener is a pair of metal tongs with heated ceramic plates used for straightening hair while smoothing is the act by which something is made smooth.

As a verb smoothing is

.

As a verb straightened

is (straighten).

As a noun straightener is

a pair of metal tongs with heated ceramic plates used for straightening hair.