peptide bond vs peptide linkage

peptide bond and peptide linkage both are nouns.

Word	Noun	Adjective	Verb	Adverb
peptide bond	Yes	No	No	No
peptide linkage	Yes	No	No	No

As nouns, peptide bond and peptide linkage are synonyms defined as:

peptide bond and peptide linkage: the primary linkage of all protein structures; the chemical bond between the carboxyl groups and amino groups that unites a peptide

peptide bond (noun)	peptide linkage (noun)
the primary linkage of all protein structures; the chemical bond between the carboxyl groups and amino groups that unites a peptide	the primary linkage of all protein structures; the chemical bond between the carboxyl groups and amino groups that unites a peptide