mono vs monaural

mono is a noun but monaural is not a noun.

Word	Noun	Adjective	Verb	Adverb
mono	Yes	Yes	No	No
monaural	No	Yes	No	No

mono (noun)	monaural (noun)
an acute disease characterized by fever and swollen lymph nodes and an abnormal increase of mononuclear leucocytes or monocytes in the bloodstream; not highly contagious; some believe it can be transmitted by kissing

mono (adjective)	monaural (adjective)
designating sound transmission or recording or reproduction over a single channel	relating to or having or hearing with only one ear