instep

As nouns the difference between arch and instep

is that arch is (inverted U shape)An inverted U shape while instep is the arched part of the top of the foot between the toes and the ankle.

As a verb arch

is to form into an arch shape.

As an adjective arch

is (knowing) Knowing, clever, mischievous.

As nouns the difference between instep and welt

is that instep is the arched part of the top of the foot between the toes and the ankle while welt is a raised mark on the body caused by a blow; a wheal or weal.

As a verb welt is

to cause to have welts, to beat.

As a verb instop

is to stop; close; shut; make fast.

As a noun instep is

the arched part of the top of the foot between the toes and the ankle.

As a verb insteep

is to steep or soak; drench.

As a noun instep is

the arched part of the top of the foot between the toes and the ankle.

As a verb unstep

is to remove (the mast) from a sailing vessel.

As a noun instep is

the arched part of the top of the foot between the toes and the ankle.

As nouns the difference between instep and arcotarsium

is that instep is the arched part of the top of the foot between the toes and the ankle while arcotarsium is the instep of the foot.