【正确答案】正确答案：Words are in different sense relations with each other in our mental lexicon. There are generally three kinds of sense relationships recognized, namely, sameness relation, oppositeness relation and inclusiveness relation. Synonymy refers to the sameness or close similarity of meaning, and words that are close in meaning are called synonyms. Total synonymy is rare, generally synonyms can be divided into several groups: dialectal synonyms like British English autumn and American English fall; stylistic synonyms like child and offspring; synonyms that differ in their emotive or evaluative meaning like collaborate and accomplice; collocational synonyms like accuse and charge; semantically different synonyms like amaze and astound. Antonymy refers to oppositeness of meaning. There are three main sub-types: gradable antonymy in which the members of a pair differ in terms of degree, like long and short; complementary antonymy which is a matter of either one or the other, like alive and dead; converse antonymy which shows the reversal of a relationship between two entities, like teacher and student. Hyponymy refers to the sense relation between a more general, more inclusive word and a more specific word. The word that is more general in meaning is called the superordinate, and the more specific words are called its hyponyms. Hyponyms of the same superordinate are co-hyponyms to each other. For example under the superordinate flower there are many hyponyms like rose, tulip, lily, etc. These members of the same flower class are co-hyponyms. Another common relationship is homonymy which refers to the phenomenon that words having different meaning have the same form, i. e., different words are identical in sound or spelling, or in both. When two words are identical in sound, they are homophones, like knight and night; when two words are identical in spelling, they are homographs, like lead v. and lead n.; when two words are identical in both sound and spelling, they are complete homonyms, like fast adj. and fast v.