ATP vs nucleotide

ATP and nucleotide both are nouns.

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

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

ATP: a nucleotide derived from adenosine that occurs in muscle tissue; the major source of energy for cellular reactions
nucleotide: a phosphoric ester of a nucleoside; the basic structural unit of nucleic acids (DNA or RNA)

Other hypernyms of ATP include base.

ATP (noun)	nucleotide (noun)
a nucleotide derived from adenosine that occurs in muscle tissue; the major source of energy for cellular reactions	a phosphoric ester of a nucleoside; the basic structural unit of nucleic acids (DNA or RNA)