there is a word that is contrast that is the only one i know!
impossible
Many words start with prefixes. Some include propose, precede, perfect, import, impossible, etc.
abnormal
Some prefixes that start with "im-" include "impossible," "imperfect," and "immature." These prefixes typically indicate negation or reversal of the word following them.
Some common prefixes that create antonyms are "un-", "dis-", "in-", "im-", "non-", and "a-". Adding these prefixes to words can change their meaning to the opposite.
Greek, from 'autos', self
Some words that have the prefix 'like' are likelihood and likewise.
inpolite
Some prefixes that go with "change" are re-, un-, dis-, and mis-. These prefixes can be added to "change" to create words like rearrange, unchanged, dischange, and mischange.
There are online dictionaries (listed below). The list of words that start with co is exhaustive. Some are coach, conservation, collateral, coalesce dictionary.reference.com/ www.merriam-webster.com/
Some prefixes that imply negative traits for a person could be "un-", "im-", "dis-", or "mal-". Add these prefixes to words like "trustworthy," "mannered," "obedient," or "behaved" to create new words suggesting naughtiness.
Some prefixes that go with the word "form" are mis-, trans-, de-, re-, and pre-. These prefixes can change the meaning of the word and create new words such as misform, transform, deform, reform, and preform.