Paronym

Paronyms are words that are pronounced or written in a similar way but which have different lexical meanings. Paronyms contrast with homonyms, which are words with different meaning having the same pronunciation or spelling. Examples of paronyms include:
Some paronyms are truly synonymous, but only under the rarest of conditions. They often lead to confusion.
The term "paronym" can also refer to words that are derived from the same root, i.e. cognate words.