Verb → Noun
decide → decision · arrive → arrival · achieve → achievement
Adjective → Noun
happy → happiness · safe → safety · weak → weakness
Noun → Adjective
beauty → beautiful · success → successful · economy → economic
Adjective → Adverb
quick → quickly · careful → carefully · good → well
Negative prefixes
happy → unhappy · possible → impossible · regular → irregular · responsible → irresponsible · agree → disagree
Other prefixes
understand → misunderstand · estimate → underestimate / overestimate