Exist is a verb and existence is a noun. The word existence has two parts: exist and ence. We call ence a 'suffix'. We add it to end of the verb exist to form a noun.
We can also use suffixes to form verbs, adjectives and adverbs. The system is being modernized. (= made modern)
I grew up in an industrial town. (= a town where there is a lot of industry) The man was behaving strangely. (= in a strange way)
There are many different suffixes, such as ence, ize, al, ly, tion and ment. Some of them can be used to form many different words. For example, there are a lot of nouns ending in tion: action, education, explanation, information, instruction, etc. There are no exact rules about which suffix you can add to which word. Adding a suffix can also involve other changes to the form of a word. industry —> industrial repeat —> repetition science —> scientist.
Now look at these examples.
They're going to play the match on Wednesday.
They're going to replay the match on Wednesday.
We can add re to the beginning of the verb play. We call re a 'prefix'. A prefix adds something to the meaning of a word. The verb replay means 'play again'. We can also add prefixes to nouns and adjectives. See G and H.
B Noun suffixes
ment the prospects for employment reach an agreement
ion/tion/sion take part in a discussion increase steel production ask for permission
ation/ition an invitation to a party people's opposition to the idea
ence/ance a preference for houses rather than flats a distance of ten miles
ty/ity no certainty that we shall succeed keep the door locked for security
ness people's willingness to help recovering from an illness
ing enter a building reach an understanding
C Nouns for people
er/or the driver of the car a newspaper editor
ist a place full of tourists a scientist doing an experiment
ant/ent an assistant to help with my work students at the university an/ian Republicans and Democrats the electrician rewiring the house ee an employee of the company (= someone employed)
notes for examinees (= people taking an exam)
We also use er for things, especially machines.
a hair-dryer a food mixer a cassette player
D Verb suffixes
Many verbs are formed by adding ize or ise to an adjective. Some are formed by adding en. ize European safety rules are being standardized. They privatized the company. en They're widening the road here. Meeting you has really brightened my day.
E Adjective suffixes
Most of these adjectives are formed from nouns.
al a professional musician Britain's coastal waters
ic a metallic sound a scientific inquiry
ive an informative guidebook an offer exclusive to our readers
ful a successful career feeling hopeful about the future
less feeling hopeless about the future (= without hope) powerless to do anything about it
ous guilty of dangerous driving luxurious holiday apartments
y a rocky path the salty taste of sea water
ly > 109A a friendly smile a very lively person
able/ible an acceptable error (= an error that can be accepted) a comprehensible explanation
a valuable painting (= worth a lot of money) a comfortable chair
F Adverbs
ly>108 He looked around nervously. I moved here quite recently.
G Some common prefixes
anti (= against) anti-roads protestors anti-government troops
inter (= between) an international match interstate highways in the US
mini (= small) a minicomputer the minibar in your hotel room
mis (= wrongly) mishear what someone says miscalculate the amount
multi (= many) multicoloured lights a multimillionaire
over (= too much) too fond of overeating overcrowded roads
post (= after) the post-war world a postgraduate student
pre {— before) pre-match entertainment in prehistoric times
re (— again) a reunion of old friends reread a favourite book
semi (= half) semi-skilled work sitting in a semicircle
super (= big) a huge new superstore a supertanker carrying oil
under (= too little) thin and underweight underpaid work
H Negative prefixes
We can also use a prefix to form an opposite. For example, the opposite of clear is unclear (= not clear). Un is the most common negative prefix.
dis a dishonest way to behave can't help being disorganized dislike the idea
disappear from the scene a disadvantage of the plan
il (+ 1) an illegal drug an illiberal attitude
im (+ m or p) an impossible task an impolite question
in an indirect route the invisible man a great injustice
ir (+ r) an irregular shape an irrelevant remark
non non-alcoholic drinks a non-stop flight
un an uncomfortable chair an unusual event an undated letter
uncertain what to do unpack your suitcase unzip the bag