curious vs singular

curious is not a noun while singular is a noun.

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

As adjectives, curious and singular are synonyms defined as:

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

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

curious (adjective)	singular (adjective)
eager to investigate and learn or learn more (sometimes about others' concerns)	grammatical number category referring to a single item or unit
beyond or deviating from the usual or expected	composed of one member, set, or kind
	unusual or striking
	being a single and separate person or thing
	the single one of its kind
	beyond or deviating from the usual or expected