monad vs 1

monad and 1 both are nouns.

Word	Noun	Adjective	Verb	Adverb
monad	Yes	No	No	No
1	Yes	Yes	No	No

As nouns, 1 is a hypernym of monad; that is, 1 is a word with a broader meaning than monad:

monad: a singular metaphysical entity from which material properties are said to derive
1: the smallest whole number or a numeral representing this number

Other hypernyms of monad include ace, I, one, single, unity.

monad (noun)	1 (noun)
(biology) a single-celled microorganism (especially a flagellate protozoan)	the smallest whole number or a numeral representing this number
a singular metaphysical entity from which material properties are said to derive
(chemistry) an atom having a valence of one

monad (adjective)	1 (adjective)
	used of a single unit or thing; not two or more