【正确答案】：
（1）ABSOLUTE SYNONYMS (COMPLETE SYNONYMS) ARE WORDS WHICH ARE IDENTICAL IN MEANING IN ALL ITS ASPECTS. I.E. BOTH IN GRAMMATICAL MEANING , INCLUDING CONCEPTUAL AND ASSOCIATIVE MEANINGS. SYNONYMS OF THIS TYPE ARE INTERCHANGEABLE IN EVERY WAY. ABSOLUTE SYNONYMS ARE RARE IN NATURAL LANGUAGES AND RESTRICTED TO HIGHLY SPECIALIZED VOCABULARY, SUCH AS SCARLET-FEVER/SCARLATINA IN MEDICINE. 
（2）RELATIVE SYNONYMS (NEAR-SYNONYMS) ARE SIMILAR OR NEARLY THE SAME IN DENOTATION, BUT EMBRACE DIFFERENT SHADES OF MEANING OR DIFFERENT DEGREES OF A GIVEN QUALITY. FOR EXAMPLE, TO CHANGE A THING IS TO PUT ANOTHER THING IN ITS PLACE; TO ALTER A THING IS TO MAKE IT DIFFERENT FROM WHICH IT WAS BEFORE.
【题目解析】：（1）绝对同义词（完全同义词）是指在各方面含义相同的词。也就是说，在语法意义上，包括概念意义和联想意义。这种类型的同义词在各个方面都可以互换。绝对同义词在自然语言中很少见，仅限于高度专业化的词汇，如医学上的猩红热/斯卡拉丁病。（2）相对同义词（近同义词）在表示上相似或几乎相同，但具有不同的含义或给定性质的不同程度。例如，更换（替换）一件事就是把另一件事放在它的位置上；更改一件事就是使它与以前不同。