Concatenation question. (One word to rule them all/most)

Is there a word for the process of adding to or removing parts from a word (prefixes, suffixes and the like) to alter it’s meaning? Like nounization, but for all types of words not just specific to verbs, adjectives or nouns.

EDIT

As clarification I would like to offer an example in another language. In Swahili – my native tongue, bear with me – they have the perfect word that I’ve never had used in any other context other than I described in my question "Unyambulishaji" so much so that the closest term in English to it is Transmission which doesn’t do the word justice given the specificity of its meaning.

I’m not looking for a general word. Something closer to the tune of Neologisms and how it’s applied rather than Manipulate. All neologisms are manipulations of a language and its sounds but not all manipulations are neologisms.