If the curve is part of the circumference of the circle, it is called an arc.
An arc is part of the circumference of a circle
noun
Circumference is a noun.
"Ellipse" is a noun.
verb
It is an action verb.
part of speech
The part of speech for this particular word is a noun.
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
im not sure
a curve.
The part of speech for "explicit" is an adjective.
The part of speech for "twirl" is a verb.
The part of speech for "unfamiliar" is an adjective.