Given a category and a set of five words, find the word from the set that does not belong (i.e. is the least relevant) with the other words in the category. Words are separated by commas.

Category: emotional status 
Words: well, detached, fine, wispy, relaxed
wispy

Category: nutritional value 
Words: iron, heavy, vitamin c, fat, brittleness
brittleness

Category: bird 
Words: flamingo, tackle, ostrich, crane, davit

tackle