Complete synonyms perfect synonyms 1).same in meaning in all its aspects
all its aspects :1.grammatical meaning（语法意义） 2.lexical meaning（词汇意义） 2). interchangeable in every way 3).rare but exist
Restricted to highly specialized vocabular Eg:1.in medicine
Scarlet-fever -----scarlatina （猩红热） 2.in lexicology
Word-building-----word-formation（构词） Composition-----compounding（合成）
Relative synonyms（相对同义词） “Words are seldom exactly synonymous” --------------Dr. Johnson Near-synonyms quasi-synonyms 1).similar or nearly the same in donation 2).including different--- shades of meaning
----degrees of a given quality
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