Branches of linguistics. Synchronic vs diachronic approaches to the language study. Lexicology – ‘the science of the word’ Lexicon

productive affixes take part in word-formation in modern English, e.g. -er, -ing, -ness, -ism, -ance, un-, re-, dis-, -y, -ish, -able, -ise, -ate;

non-productive affixes are not active in word-formation in modern English, e.g. –th, -hood, -some, -en;

non-productive affix == dead affix
Word-composition. Types of compound words. Criteria for their classification.

Word-composition (compounding) is the formation of words by morphologically joining two or more stems.

A compound word is a word consisting of at least two stems which usually occur in the language as free forms, e.g. university teaching award committee member.