Malapropism

Malapropism is switching or swapping a wrong word (intentional or unintentional) to a word with the same chime or sound as the intended word. 

If it is intentional, some people resort to malapropism to pull off a comic stunt ... or they come off with humor lines provoking laughter and mirth.

Word retrieval problems are usually age-related changes in the brain ... or mental health conditions ... at times neurological.

Statement: My friend always wears his COLOGNE, so he always smells good.

Malapropism: My friend always wears his COLON ... I am unsure whether he always smells good.

In malapropism, if the intention is to make people laugh ... well and good ...  but if the person is tongue-tied because he is groping for words ... a situation where the person is having trouble finding the right word ... to finish his statement.

There is a blackout in the person. Instead, he switched or swapped some words to a word that sounded like the intended word.