Do you know the difference between happy and unhappy, between behave and misbehave, between embark and disembark, between normal and abnormal, between circle and semi-circle?

You will recognize the difference more readily if you know the meanings of the little word or syllables (called prefixes) which are placed at the beginning of the second word in each pair.
Can you form a noun denoting the state of being good or a verb from stiff? What is the diminutive of part and what is the adverb formed from brave? These nouns, verbs and adverbs are formed by the addition to the primary or simple words of certain endings (called suffixes)

AFFIX

An affix is a word attachment to a root or stem that gives a word a different meaning. The Writers Dictionary
An affix literally "fix" es itself to a root word or stem word and changes the meaning of a word. It may be attached to the beginning or the end of a root or stem word. When an affix is attached to the beginning of a word, it is called a prefix and attached to the end of a word, it is called a suffix.

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To make new words and to change the meaning of the root or stem word, some root or stem words may have both an affix and a suffix or multiple affixes and suffixes.

The two most common affixes are prefixes and suffixes. Prefixes and suffixes are not words and must be attached to a stem or root word to create a new word with a new meaning.

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Example of a Prefix (affix)

Every prefix has a meaning:

• the prefix: 'un' means 'not'
• the root word: 'clear' means 'bright,' 'free from difficulty'
• So un + clear = unclear, meaning: 'not clear' or 'dim', 'difficult to see' or 'understand'

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Prefix - Where? In the beginning, "pre" - before.
"pre-" "sub-" "like-"
Example Prefix:
Preview, unlike, substandard
Root or stem words:
view, like, standard

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Suffix - Where? At the end - "suf" - after/under
-"ly" -"able" -"ness"
Example of Suffix
Likely, workable, coldness
Root or stem words:
like, work, cold

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Source: ***EBH Joubert
https://writingexplained.org/grammar-dictionary/affix

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