antebellum
antecede
anteceded
antecedence
antecedences
antecedent
antecedently
antecedents
antecedes
anteceding
antecessor
antecessors
antechamber
antechambers
antechapel
antechapels
antechoir
antechoirs
anted
antedate
antedated
antedates
antedating
antediluvian
antediluvians
anteed
antefix
antefixa
antefixae
antefixal
antefixes
anteing
antelope
antelopes
antemortem
antenatal
antenatally
antenna
antennae
antennal
antennas
antennular
antennule
antennules
antenuptial
antepast
antepasts
antependia
antependium
antependiums
antepenult
antepenultima
antepenultimas
antepenultimate
antepenults
anterior
anteriorly
anteroom
anterooms
antes
antetype
antetypes
antevert
anteverted
anteverting
anteverts
Some prefixes for positive are "pro-", "co-", "anti-", and "super-".
anti pre non un in bi re post
abnormal
anti-superstition, anti-aircraft, antibiotic, anticlimax, anticlimactic
impossible
Some prefixes that start with "im-" include "impossible," "imperfect," and "immature." These prefixes typically indicate negation or reversal of the word following them.
At a rough guess, I would say there are hundreds of such prefixes. I'll help begin your project, however, with four of my favourites; hemi-, semi-, demi- and halv- ...all of which mean 'half'
Some common prefixes include: un-, dis-, mis-, re-, pre-, post-, in-, non-, anti-, bi-, tri-, sub-, super-, mega-, mini-.
one such prefix is anti-.
there is a word that is contrast that is the only one i know!
un- in- ir- non- anti- counter- contra-
These are not words but prefixes. E.g.: cooperation, coexistance; excommunicate, exciting, anti-communist, anti-fasist.