Inflection v/s Derivational Morphology

INFLECTIONAL V/S. DERIVATIONAL MORPHOLOGY
Morphology, the study of the structure and form of words in language or a language, including inflection, derivation, and the formation of compounds. morphology is the identification, analysis and description of the structure of a given language's morphemes and other linguistic units, such as words, affixes, parts of speech, intonation/stress, or implied context (words in a lexicon are the subject matter of lexicology).
Another important and perhaps universal distinction is the one between derivational and inflectional morphemes.
Derivational morphemes makes new words from old ones (Crystal, p. 90.) Thus creation is formed from create , but they are two separate words.
Derivational morphemes generally:
1) Change the part of speech or the basic meaning of a word. Thus -ment added to a verb forms a noun (judg-ment). re-activate means "activate again."
2) Are not required by syntactic relations outside the word. Thus un-kind combines un- and kind into a single new word, but has no particular syntactic connections outside the word -- we can say he is unkind or he is kind or they are unkind or they are kind, depending on what we mean.
3) Are often not productive -- derivational morphemes can be selective about what they'll combine with, and may also have erratic effects on meaning. Thus the suffix -hood occurs with just a few nouns such as brother, neighbor, and knight, but not with most others. e.g., *friendhood, *daughterhood, or *candlehood. Furthermore "brotherhood" can mean "the state or relationship of being brothers," but "neighborhood" cannot mean "the state or relationship of being neighbors."
4) Typically occur between the stem and any inflectional affixes. Thus in governments,-ment, a derivational suffix, precedes -s, an inflectional suffix.
5) In English, may appear either as prefixes or suffixes: