older words tend to become obsolete or their scope is reduced to certain fields or registers
new words are coined or adapted to fulfill new realities.
concerns the generation of innovative word forms or
the use of former ones with a different purpose or applied to a new field.
the creation of new words thanks to a series of processes (the 1st two referred to affixation)
putting a suffix after the base, sometimes without but more usually with a change of word-class(friend-less)
assigning the base to a different word class with no change of form (carpet the room)
putting a prefix in front of the base, sometimes with but usually without a change of word-class (pre-determine)
adding one base to another. The one placed in front in some sense usually subcategorizes the one that follows (armchair)
the morphological and syntactic features remain the same
metaphor is one of the most relevant examples
If we follow the principles of economy in lg use, it seems pretty obvious that the best way to make new words is by changing or adapting existing ones.
one of the most recurrent phenomena used nowadays is the borrowings of terms which do not exist formerly in our language,
we even find the case of words which were supposed to be coined by taking a concept from a foreign language which in fact, does not exist (footing)
but can be adopted either by using the same word as it is written in the original language (manager) or by adapting it to the new lg, either in the written(futbol) or oral form (wi-fi)
It is another of the major features of word formation processes within a language