In traditional Tamil grammar ‘Kootaakkam’ is called
‘Thogaiaakkam’.‘Kootakkam’ is the method in which new
words are created by combining various parts of
speech such as noun i.e., (peyargal) ,verbs i.e.,(vinaigal),
adjectives i.e., (peyaradaigal) and adverbs i.e.,vinayadikal
(adverbs). New words can be created by combining 2
nouns, combining a verb with a noun, combining a noun
with a verb, combining an adjective with a noun,
combining a verb with a verb and so on.

    ‘Munnotaakkam’ is the creation of a new word by
attaching a prefix to an already existing word.
‘Pinnotaakkam’ is the creation of a new word by
attaching a suffix to an existing word or through
inflections. In Tamil, ‘Pinnotaakkam’ is the most widely
practiced method of ‘solaakkam’. ‘Maatram’ is the
method in which a word belonging to a particular part
of speech or class is used as a different part of
speech without any change in its form. For example, a
word that functions as a noun may be also used as a
verb in a different context without any change in its
form. ‘Pin vadivaakkam’ or ‘Pinaakkam’ is the technique
of creating new words by deriving a verb from a noun.
This technique is not used very often in Tamil.
‘Kathiripaakkam’ is the creation of new words by
abbreviating existing words. This technique is largely
used to simplify complex words. ‘Kalappakkam’ is a
method of solaakkam where parts of 2 existing words
are combined to coin a new word. This technique is
very rarely used in Tamil solaakkam. Creating new
words by     forming     acronyms     is called
‘Thalaippezhuthaakkam’. Tamil has a number of English
acronyms. ‘Sol uruvaakkam’ is the process of creating
an entirely new word in a language.