right triangle vs right-angled triangle

right triangle and right-angled triangle both are nouns.

Word	Noun	Adjective	Verb	Adverb
right triangle	Yes	No	No	No
right-angled triangle	Yes	No	No	No

As nouns, right triangle and right-angled triangle are synonyms defined as:

right triangle and right-angled triangle: a triangle with one right angle

right triangle (noun)	right-angled triangle (noun)
a triangle with one right angle	a triangle with one right angle