triangle vs trilateral

triangle and trilateral both are nouns.

Word	Noun	Adjective	Verb	Adverb
triangle	Yes	No	No	No
trilateral	Yes	Yes	No	No

As nouns, triangle and trilateral are synonyms defined as:

Other synonyms of triangle include trigon.

triangle (noun)	trilateral (noun)
a percussion instrument consisting of a metal bar bent in the shape of an open triangle	a three-sided polygon
any of various triangular drafting instruments used to draw straight lines at specified angles
a three-sided polygon
something approximating the shape of a triangle

triangle (adjective)	trilateral (adjective)
	having three sides
	involving three parties