singular vs singular form

singular and singular form both are nouns.

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

As nouns, singular and singular form are synonyms defined as:

singular and singular form: the form of a word that is used to denote a singleton

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

singular (adjective)	singular form (adjective)
grammatical number category referring to a single item or unit
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