Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun sub

2 senses of sub

Sense 1
bomber, grinder, hero, hero sandwich, hoagie, hoagy, Cuban sandwich, Italian sandwich, poor boy, sub, submarine, submarine sandwich, torpedo, wedge, zep -- (a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States)
       => sandwich -- (two (or more) slices of bread with a filling between them)

Sense 2
submarine, pigboat, sub, U-boat -- (a submersible warship usually armed with torpedoes)
       => submersible, submersible warship -- (a warship designed to operate under water)

Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb sub

1 sense of sub

Sense 1
substitute, sub, stand in, fill in -- (be a substitute; "The young teacher had to substitute for the sick colleague"; "The skim milk substitutes for cream--we are on a strict diet")
       => exchange, change, interchange -- (give to, and receive from, one another; "Would you change places with me?"; "We have been exchanging letters for a year")