rectangular vs orthogonal

rectangular and orthogonal both are adjectives.

Word	Noun	Adjective	Verb	Adverb
rectangular	No	Yes	No	No
orthogonal	No	Yes	No	No

As adjectives, rectangular and orthogonal are synonyms defined as:

rectangular and orthogonal: having a set of mutually perpendicular axes; meeting at right angles

rectangular (adjective)	orthogonal (adjective)
having four right angles	not pertinent to the matter under consideration
having a set of mutually perpendicular axes; meeting at right angles	having a set of mutually perpendicular axes; meeting at right angles
	statistically unrelated