polynucleotide vs nucleotide

polynucleotide and nucleotide both are nouns.

Word	Noun	Adjective	Verb	Adverb
polynucleotide	Yes	No	No	No
nucleotide	Yes	No	No	No

As nouns, nucleotide is a hypernym of polynucleotide; that is, nucleotide is a word with a broader meaning than polynucleotide:

polynucleotide: (biochemistry) a linear polymer whose molecule is composed of many nucleotide units constituting a section of a nucleic acid molecule
nucleotide: a phosphoric ester of a nucleoside; the basic structural unit of nucleic acids (DNA or RNA)

Other hypernyms of polynucleotide include base.

polynucleotide (noun)	nucleotide (noun)
(biochemistry) a linear polymer whose molecule is composed of many nucleotide units constituting a section of a nucleic acid molecule	a phosphoric ester of a nucleoside; the basic structural unit of nucleic acids (DNA or RNA)