arc sine vs circular function

arc sine and circular function both are nouns.

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

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

arc sine: the inverse function of the sine; the angle that has a sine 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 sine include trigonometric function.

arc sine (noun)	circular function (noun)
the inverse function of the sine; the angle that has a sine 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