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: date status 
Words: belated, current, tide, up to the moment, postponed
tide

Category: construction 
Words: digger, concrete pourer, crane, derrick, excavator
derrick

Category: animal 
Words: walk, pounce, leap, fly, grasshopper

walk