extraneous vs orthogonal

extraneous and orthogonal both are adjectives.

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

As adjectives, extraneous and orthogonal are synonyms defined as:

extraneous and orthogonal: not pertinent to the matter under consideration

Other synonyms of extraneous include immaterial, impertinent.

extraneous (adjective)	orthogonal (adjective)
not belonging to that in which it is contained; introduced from an outside source	not pertinent to the matter under consideration
not pertinent to the matter under consideration	having a set of mutually perpendicular axes; meeting at right angles
coming from the outside	statistically unrelated
not essential