Almost a synonym: a word that means almost the same thing as another.
A system of synonyms.
The collective synonyms (all the names referring to a particular taxon, except the correct name)
The state of not being a correct name, of being a synonym
The quality of being synonymous; sameness of meaning.
A list or collection of synonyms, often compared and contrasted.
The study of synonyms.
The collective synonyms (all the names referring to the same taxon, including the correct name)