arc secant vs circular function

arc secant and circular function both are nouns.

Word	Noun	Adjective	Verb	Adverb
arc secant	Yes	No	No	No
circular function	Yes	No	No	No

As nouns, circular function is a hypernym of arc secant; that is, circular function is a word with a broader meaning than arc secant:

arc secant: the inverse function of the secant; the angle that has a secant equal to a given number
circular function: function of an angle expressed as a ratio of the length of the sides of right-angled triangle containing the angle

Other hypernyms of arc secant include trigonometric function.

arc secant (noun)	circular function (noun)
the inverse function of the secant; the angle that has a secant equal to a given number	function of an angle expressed as a ratio of the length of the sides of right-angled triangle containing the angle