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: mode of transportation 
Words: spider, fly, drive, train, soar
spider

Category: alcoholic drinks 
Words: wine, rum, bridge, tonic, gin
bridge

Category: corporate 
Words: alignment, leverage, firm, taut, concerted

taut