odd vs singular

odd is not a noun while singular is a noun.

Word	Noun	Adjective	Verb	Adverb
odd	No	Yes	No	No
singular	Yes	Yes	No	No

As adjectives, odd and singular are synonyms defined as:

Other synonyms of odd include curious, funny, peculiar, queer, rum, rummy.

odd (noun)	singular (noun)
	the form of a word that is used to denote a singleton

odd (adjective)	singular (adjective)
not divisible by two	grammatical number category referring to a single item or unit
an indefinite quantity more than that specified	composed of one member, set, or kind
of the remaining member of a pair	unusual or striking
beyond or deviating from the usual or expected	being a single and separate person or thing
not used up	the single one of its kind
not easily explained	beyond or deviating from the usual or expected