What does Lexicology, a brunch of linguistics study?

What is the name of the area of lexicology specializing in the semantic studies of the word?

What do we mean by external structure of the word?

On what level is the word studied in its relationships with other words in the vocabulary system?

What is the smallest meaningful unit of speech?

What is the leading semantic component in the semantic structure of the word?

What is the main way of enriching and enlarging the English vocabulary?

Metaphor, metonymy, hyperbole are ... .

All morphemes are subdivided into two large classes

What is the common word for such terms as "set expressions, fixed word- groups, set phrases"?