"Radius" is primarily a noun. It refers to a straight line from the center of a circle to its perimeter, or it can denote the distance from the center to the edge of a sphere. In specific contexts, such as geometry or anatomy, it may also represent a measurement or a specific bone in the forearm.
The filet is part of the radius, therefore making the term filet radius. A filet radius measures an inside corner. A corner radius measures an outside corner.
noun
Circumference is a noun.
"Ellipse" is a noun.
radius
A radius is not part of pi.
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
what part of speech is beneath
adverb
head of radius
The part of speech for "explicit" is an adjective.
The part of speech for "lecturer" is a noun.
The part of speech for "rapid" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "breezy" is an adjective.