Criteria of synonymity is interchangeability. .......................... that neither the traditional definition of synonyms nor the new version provide for any objective criterion of similarity of meaning.

Antonyms are words of the same part of speech, but opposite in meaning. Many words, especially those denoting concrete objects (chair, tree, tiger) have no antonyms. Usually adjectives denoting qualities, verbs ............................. actions or state and abstract nouns have antonyms

A morpheme is also an association of a given meaning with.................. But unlike a word it is not autonomous. Morphemes occur in speech only as constituent parts of words, not independently, although a word may consist of a single morpheme

.......................................... exist in language and are reproduced in speech as ready-made units, whereas free word groups or combinations are created in speech every time we need them.

...................................................., some prefixes express the difference between a transitive and an intransitive verb: stay v and outstay (smb) v t. With a few exceptions prefixes modify the stem for time (pre-, post-), place (in-, ad-), negation (un-, dis-) and remain semantically rather independent of the stem

Lexicology is …………………. with words, variable word-groups, phraseological units, and with morphemes which make up words