1) The document discusses lexical cohesion, which refers to the cohesive effect achieved through the selection and repetition of vocabulary within a text. 2) Lexical cohesion can be created through the use of general nouns, reiteration of the same lexeme, lexical relations like synonyms, and collocations between words that share the same semantic field. 3) While individual lexical items on their own do not indicate cohesive function, words can serve a cohesive role when they are part of a whole text through relationships like repetition, hypernymy and collocation.