Лексическая сочетаемость. Фразеология

Words put together to form lexical units make phrases or word-groups.
It will be recalled that lexicology deals with words, word-forming morphemes and word-groups. We assume that the word is the basic lexical unit.1 The smallest two-facet unit to be found within the word is the morpheme which is studied on the morphological level of analysis. The largest two-facet lexical unit comprising more than one word is the word-group observed on the syntagmatic level of analysis of the various ways words are joined together to make up single self-contained lexical units.