Saw a sample essay using this really sparkly term for how words move from one word class to another by adding suffixes e.g. having a 'friend' becomes 'friending' someone by adding the suffix 'ing' to change the noun into a verb. Friending is then a neologism (new word) formed by the process of derivational morphology.
A2 will know this process under the Language Change terminology 'conversion' (converting a word from one word class to another but in that process you don't have to add an affix e.g. the proper noun Google becomes the verb to google without any morphological change).
Also try and get a handle on back-formation, which is a similar process and also high-level.
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