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Morphology studies words, their formation and structure. Tha basic concept of morphology is morpheme. Morpheme is the smallest unit of language. Morphemes are divided into following categories:
Some suffixes (like forming infinitive and participles) can be treated either as derivational of inflectional depending on whether interpret these forms as separate lexical categories or as forms of verb. This wiki place them at inflectional suffix list.
Most prefixes of Standard and Modern Nûrlâm were suffixes in Archaic language.
Clitics mostly belong to free morphemes, but may be functioning also as inflectional suffixes (case postpositions, aspect adverbs).
When several suffixes required to join the root, they form a chain with fixed suffix order. Rules of this order for each part of speech are described at corresponding chapters of Grammar section.
Black Speech excessively uses compound words for derivation. Basing on Tolkien's examples rules are the following:
Black Speech is considered an agglutinative synthetic language. In pure agglutinative language each inflectional morpheme should carry information on one grammatical category only, and each grammatical category should be expressed with same affix for different parts of speech (lexical category). Classical Black Speech can be analyzed also as polysynthetic language where one long word may be translated into a whole sentence of typical fusional language or several words belonging to distinct lexical categories (e.g. word “durbatulûk” = “to rule them all”). Nûrlâm has also some traces of fusional language for example in participle suffixes, standalone personal pronouns' inflection and phonetical merging of adjacent sounds which makes it harder to divide suffixes in chain one from another or from word's root. Colloquial Debased Black Speech spoken by orcs in “The Lord of the Rings” belongs more to analytical language where grammar is expressed through word order.