circular function vs trigonometric function

circular function and trigonometric function both are nouns.

Word	Noun	Adjective	Verb	Adverb
circular function	Yes	No	No	No
trigonometric function	Yes	No	No	No

As nouns, circular function and trigonometric function are synonyms defined as:

circular function and trigonometric function: function of an angle expressed as a ratio of the length of the sides of right-angled triangle containing the angle

circular function (noun)	trigonometric function (noun)
function of an angle expressed as a ratio of the length of the sides of right-angled triangle containing the angle	function of an angle expressed as a ratio of the length of the sides of right-angled triangle containing the angle