unity vs singleton

unity and singleton both are nouns.

Word	Noun	Adjective	Verb	Adverb
unity	Yes	No	No	No
singleton	Yes	No	No	No

As nouns, singleton is a hyponym of unity; that is, singleton is a word with a more specific, narrower meaning than unity:

Other hyponyms of unity include monad, monas.

unity (noun)	singleton (noun)
the quality of being united into one	the playing card that is the only card in a suit held in a bridge hand as initially dealt
the smallest whole number or a numeral representing this number	a set containing a single member
an undivided or unbroken completeness or totality with nothing wanting	a single object (as distinguished from a pair)