The difference between Nucleic acid and Nucleotide
When used as nouns, nucleic acid means any acidic, chainlike biological macromolecule consisting of multiply repeat units of phosphoric acid, sugar and purine and pyrimidine bases, whereas nucleotide means the monomer constituting dna or rna biopolymer molecules. each nucleotide consists of a nitrogenous heterocyclic base (or nucleobase), which can be either a double-ringed purine or a single-ringed pyrimidine.
check bellow for the other definitions of Nucleic acid and Nucleotide
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Nucleic acid as a noun (biochemistry, genetics):
Any acidic, chainlike biological macromolecule consisting of multiply repeat units of phosphoric acid, sugar and purine and pyrimidine bases; they are involved in the preservation, replication and expression of hereditary information in every living cell
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Nucleotide as a noun (biochemistry):
The monomer constituting DNA or RNA biopolymer molecules. Each nucleotide consists of a nitrogenous heterocyclic base (or nucleobase), which can be either a double-ringed purine or a single-ringed pyrimidine; a five-carbon pentose sugar (deoxyribose in DNA or ribose in RNA); and a phosphate group.