Stylistic use of synonyms

The part of speech formed ( noun-prefixes and suffixes - swimm er, free dom, happi ness, justific ation); adjective - agree able, help less, help ful, poet ic; verb - en able, un button; dark en, satis fy, harmon ize; adverb -quick ly, east ward).
The lexico-grammatical character of the stem the affix is added to ( deverbal - speak er, read ing, agree ment, suit able; re -write, over do, out stay; denominal - un button, ex -president; hand less, child ish, trouble some; de-adjectival (and participles) - un easy, un smiling, un seen; black en, slow ly, redd ish, bright ness).
Affixational meaning (prefixes: negative - un grateful, non- political, dis advantage, a moral (ill - before [l], im - before [p,m], ir before [r], in before any other sound); prefixes of time - pre -war, post- war, ex- president; repetition - re -write; suffixes: the agent of the action - bak er, defend an t; appurtenance - Arab ian, Chin ese; collectivity - peasant ry, king dom; diminitiveness - girl ie, cloud let, wolf ling).
Stylistic reference (neutral - un natural, over see; cap able, sing er; of certain stylistic reference - pseudo- classical, super structure).
The origin of the affix ( - ness, -ish, -dom,; be-, mis-, un - are of native origin and many were originally independent words (hood - had - «state, condition»); ation, -ment, -able; dis-, ex-, re - are of foreign origin.
The degree of productivity is an important aspect of synchronic description of every derivational pattern within the two types of word-formation. Three degrees of productivity are distinguished for derivational patterns and individual derivational affixes: highly-productive, productive or semi-productive, non-productive.
There are quite a number of polysemantic, homonymous and synonymous derivational affixes in English. Polysemy is illustrated by the suffix -y having the following meanings: 1) composed of, full of - bony, stony; 2) characterized by - rainy, cloudy; 3) resembling what the base denotes - bushy, inky). Homonymy may be represented in the cases when the adverb-suffix -ly added to the adjectival bases (quickly, slowly) is homonymous to the adjective-suffix -ly added to the noun-bases (lovely, friendly). The suffix -er of native origin denoting the agent is synonymous to the suffix -ist of Greek origin (teach er, journal ist ).
Words that are made up of elements derived from two or more different languages are called hybrids ( unmistakable - un ( En) + mis (En) + tak (Scand) + able (Fr)).
Conversion as a Way of Word-formation.