orthogonal vs rectangular

orthogonal and rectangular both are adjectives.

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

As adjectives, orthogonal and rectangular are synonyms defined as:

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

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